Well, that's just a claim, not an ideology - but I guess it depends on the particulars. In my view, the problem with populism isn't, necessarily, the erosion of public trust, or any particular policies. The problem is that it elevates, celebrates, stupidity over intelligence.
Are you a populist?
Why? What about your political philosophy would you call "populist"?
Words ebb and flow, and, especially in politics, get twisted around. But all the definitions of populism that I've found included, as the core theme, the quote in the OP - namely the idea that the opinions of ordinary people are just as valuable as educated experts - or even moreso. And that strikes me as a plainly dumb way to approach governing a country.
The reason I selected that specific claim, thank you yes-I'd extended it to others stating similar things as more of an ideology but in that quote only one opinion, but it brought about my own thoughts of what I think of good populist traits opposed to the bad traits often presented by individuals.
Quick history- as a child-fully trusted everything the government revealed. My parents were both conservatives although my dad came from a long line of Democrat farmers. That side of the family still solid Democrat, mom's all Republicans. Politics were discussed but not a primary topic. Teens-still fully trusted governmental officials because I thought the media would expose all important falsehoods. Yikes was I off! lol Young adult-learned media could go either way with info mostly depending on the political position of the network- a person could choose. As an adult-can't trust media owned by NY billionaires unless it's full promotion of liberal viewpoints, can't trust most governmental reps to tell the truth nor follow through on their words, and forget about media calling out anything unless it fits their network's agenda. I would prefer to trust all entities mentioned although would reflect a very different reality.
Am I a populist you asked? I don't know, depends upon the definition. I find parts of the standard definition fitting-about self-responsibility being a core root to all action. Individuals get things done by grouping together with similar mindsets, gathering the numbers to gain traction. Populism is defined as supporting the individual, which I extend to supporting small businesses, new start-ups finding it more than difficult to get an edge in now often can't compete with the the mega-corporations. IMO-there should be no corps acting like monopolies. It has been argued in court that Facebook for example, is in fact a monopoly on that particular market. It's very hard to take food away from a lion, but much easier to divide up the shares before distribution. Hmmm if that sounds close to being socialistic in nature I'm missing the mark. I reject any effort that encourages more people to remain on governmental checks/tax payer money. The recent 2-month unemployment extension increased the length of unemployment and was more than wrong, when employers are begging for workers all over the place.
A good populist is an informed populist. You're referring to people who don't do the leg-work to be informed. Yes, those who don't read much get in the mix and found in most all political groups. A lot of your commoners will not be dressed in fashionable attire, we prefer comfort-tee shirts and jeans

The media selects which individuals to follow and film. They choose the most entertaining ones perhaps. Are there political rallies that have people with very little knowledge about most topics, including politics? Yes, but let's not extend that impression to falsely say that all who claim to be a populist are exactly like the rest, cookie cutter images even.
Same deal with saying I'm a libertarian. From that label alone people have made all kinds of incorrect assumptions and most being way off. A person hears that one individual, a libertarian for instance, who due to his political beliefs does not involve showing proof of jab to an employer. He likes his job, gets the jabs, but decides to wear his mask at work even though not required. His reason is that he didn't want to show proof of vaccine to his employer. Now personally, if I had the jabs I'd show the paperwork. So, I'd say that person is either more of a libertarian that I am or...a different blend of one. One person who claims to be "X" says something or does something and all others who accept that same label will share in the "Oh! Look what they are doing now!" blanket representation. You can see it happening with all groups given a collective label representing that everyone under that label is the same which is never the case unless maybe identical twins...but even then you cannot say all ideas are identical.
So, what does all of that have to do with being a part-populist? A good populist does not sit around on her or her bum, unless of course posting on USMB lol