This is social media, not a peer-reviewed journal. I don't think primary sources are necessary to justify basic numbers.
Pointing out that Pinker isn't a primary source isn't ad hominem. Bringing up that he's a psychologist and popular writer, repeatedly, is very much ad hominem. It's trying to discredit the messenger in order to dismiss the message. Don't do that, it's bad rhetoric.
Popular science writers serve an important role in disseminating ideas. As long as they're not misquoting sources, making up facts, or applying radical interpretations, there's nothing wrong with them. I don't see Pinker doing any of those things (if you disagree, be sure to source that!). And although Pinker may not be a climate scientist, he is a scientist of considerable credentials. He has taught at MIT, Stanford, and is a full professor at Harvard. In my mind, that brings a great deal of credibility to what he has to say on other scientific subjects, at least when quoting numbers.
So your arguments, as presented, provide approximately zero reason to doubt the numbers presented by the OP.