You mean Scott Adams, I assume, Douglas Adams has been dead since 2004
That said, Scott Adams has a known conservative lean to him, and I think we in the states have seen exactly how paranoid the big-r Right can be about things that there's no real evidence of.
And this: "I won’t ask you to believe me about Twitter’s backdoor assault on the First Amendment." Seriously, Scott? I get that you're a brilliant man, but that simply means you should know this better - a company telling you can't say something on their platform, which we don't have any actual evidence of here, isn't an assault on the First Amendment, because it doesn't apply to companies. It's so freakin' disingenuous to call it an assault on the First Amendment!
Honestly, I don't see any reason Twitter would do this - he even mentions that it's "done to seem like a bug or perceptually different". Truthfully, it could literally just be Twitter giving him lower relevance.