One could also say that his complaint is that he used to be a bigger fish relative to the pond, but now that there are more users on the platform he is getting more competition.
He presumably considers his content "good things" and wants relevant people to see it, and at one point they did. Just as he found good content.
He thinks they're now being shown rage-inducing bullshit instead by the algorithm.
You seem to agree with this analysis from the point of view of a reader, but think from a writers point of view he's just being outcompeted by better content. That seems inconsistent.
So what is his move, to get good non rage bait content to an audience, except to leave twitter?