When people say he used Twitter to do this no one means that it was because he organized the thing directly in a single tweet, but the months of unhinged election misinformation he constantly posted between losing the election and the Capital attack where he purposefully worked people into a frenzy. You're looking at a drop of water while standing in an ocean and going 'is this water?'
Yes, he has other options for doing bad things, therefore the reach of those options doesn't matter is a silly argument. Literally, you can see that banning him from Twitter worked just by looking at Nintex posts here. Whereas he would repost every dumbass thing Trump said 11 times a day before the ban, after he had to post second hand-tweets from Jared Kushner or some shit that went "Just spoke to the president, ..." or post the stupid Trump press releases that no one looked at but Nintex. If the cat is out of the bag you don't just let it wander the house, you put it back in the bag and drown it.
Also, yes AOC is a known exaggerater, so let's give uncharitable readings to everything she says just to further show what an exaggerater she is. What a fun game to do. It's not like repeatedly doing this day in day out is the reason why Nintex has the reasoning skills of a wombat.