That is true if the 'hunting rifle' will take large capacity interchangeable magazines. Over 5 is large capacity in this scenario. If the 'hunting rifle' won't take those magazines it is definitely functionally dissimilar to an AR15.
Okay, here is a refresher course of why an AR is an AR. We go through this about every other month or so. Seems the gunnutters think the rest of us forget.
Why was the AR-15 invented?
It was invented so that an 18 year old kid with very little training, right out of basic, can kill at a high rate as many people as he can, reload quickly and effortlessly, carry many times the ammo of the previous combat rifles, carry his rifle for hours, days and weeks on end without fatigue. Nothing was included for cosmetics. It's design is function only. And it's function is to kill other people. It's design is the best design in the world and all others successful combat rifles have copied the AR in functions.
Being black doesn't make it more lethal. It would be just as lethal if it were pink but it's black because it's hard to see at night, another function. The Mag drops straight down without having to even place a hand on it so that you can drop it while reaching for a replacement mag. Another feature. You can operate it without taking your finger out of the trigger guard. Another feature. You don't have to rotate the rifle to reload or recharge it. Another feature. It has almost zero barrel jump. Another feature. It's simple to operate for a novice shooter or a new combat shooter under extreme pressure under fire. Another feature. It's just deadly enough to get the job done against a human sized target. Another feature. There are methods to add rails to it to add combat related accessories to increase it's deadliness. Another feature.
There are no features that don't apply to killing human beings. No features to make it look pretty. No features to apply lip gloss or anything else that doesn't have anything to do with killing humans. Just because it can be used to kill a groundhog doesn't means it's designed as a great varmint rifle. If I need to hammer something and the hammer is in the shop, I've been know to use a crescent wrench in a pinch. Does that make my crescent wrench a hammer?
The fact remains that the AR is designed for one thing and one thing only, to wholesale kill a large group of people in the most efficient method possible. And even the M-16 and the M-4 is normally operated in combat in the semi auto mode because that is the most efficient mode. The Full Auto of the old A-1 and A-2 wasted way too much ammo and missed the target most of the time and the 3 shot burst, only the first round hits the target anyway and you just wasted 2 rounds. So in combat, most are shot in the semi auto setting because that is the setting where it is the most useful. So the AR-15 Model 750 and various clones are just as deadly as the M-16 and the M-4 and the M-16 and the M-4 are the premier Combat Rifles in the world because they are designed to be. Not one ounce of design for anything other than that of a combat rifle.
So what is an AR-15? A Combat Rifle and if it's not the best, it's one of the best ever made.