Funny that the people on Mastodon care about the Twitter API more than the people using Twitter. That says a lot.

The linked account is the developer of one of the most prominent third party Twitter clients.

A lot less than you think. There's no such thing as "on Mastodon" and I picked https://tapbots.social quite carefully, as it's the instance where discussions about TweetBot are most likely to be replicated, given that it's the instance run by Tapbots. One has to pick the right communities, in the FediVerse.

https://know.me.uk/tags/tweetbot is a very different story, to pick an example. It's another Mastodon WWW server in the FediVerse but as can be seen almost none of today's news about TweetBot can be found there. One of the things about the FediVerse is that one cannot generalize about the entire FediVerse from what is visible from a single instance.

If we're being so pedantic, you have misspelt 'Fediverse'.

It is not pedantic, as "Mastodon" is massively misnomered, and used where either the Fediverse or its open standard protocol ActivityPub is actually referred to. And as that happens more and more people get confused about this, so it prolongs if not pointed out at any opportunity.