I'll answer that, since notmyfault doesn't want to. My guess is that NMF believes that the untrue part is so obvious that you must be clowning him to ask that question. I'll give you the benefit of the doubt that you really don't know. But, I'm probably being clowned, so NMF is not wrong.
After Joe Biden won the 2020 presidential election, McCarthy supported Trump's false denial of Biden's victory and participated in efforts to overturn the results,[7][8] and while he condemned the January 6 United States Capitol attack in its immediate aftermath, blaming Trump for the riot and saying the 2020 election was legitimate,[9][10] he would later walk back these comments and reconcile with Trump.
That part in red and similar statements have been repeated in the media so often that you likely assume that it is a correct factual characterization. It isn't. That the 2020 election was stolen, illegitimate, that Trump really won, etc. is opinion. Opinion =/= lie, no matter how much you may be of a different opinion.
The same with Stacy Abrams' denial of the legitimacy of her own election loss.
We know that there were irregularities in the 2020 election. They are well documented. People whose opinion that the election was stolen or illegitimate are the ones who are more interested in those irregularities. They have read about the irregularities, seen videos of the irregularities, and likely followed the irregularities fully admitted to in the recent Arizona election.
Those who are of the opinion that it is only sore losers who are complaining about the election are less likely to delve into what happened. Likely they believe that there were no irregularities in 2020, or that any irregularities were no different than the kinds of irregularities that happen in any election year.
Each side has an opinion. It is not objective at all to say that one side is "lying." It would be just as biased if a journalism outlet said that "Biden lied again by denying irregularities in his election."