Tankie is a pejorative. We should stop using that - I am not sure what the best replacement is, authoritarian? Fascist?
OP seems to believe that the unfair admin/mod practices stem from their political beliefs. e.g., going against their very own Code of Conduct, the amins in question used subversive database manipulation practices to eliminate the mod-log explanations for their actions, and also preemptively banned various people from communities that they had never (even so much as once) commented in, in the past. The latter is EXTREME, and the former is disingenuous.
Oh, but the admin is an authority-loving fascist, hence it suddenly all makes sense: "service to stated principles that serve the community good" give way to "whoever has the power to accomplish things does whatever they want", in that world-view. So they are not entirely as disconnected as you might wish in a purely mathematical & theoretical world. This is the real world, where it gets messy, and EVERYTHING gets political. But okay, what if OP made a poorly-written post - b/c their heart jumped out ahead of their brain - what then? It doesn't mean that it's not true, or a good thing to do, even then, and moreover what to do about it now? Re-word it if you like and write and post a new one? But this is the one that we have. Yeah, again, irl gets messy sometimes.
You missed some stuff yourself btw. As individual people block you - by which I do not just mean personally but your entire instance of choice - increasingly you will find yourself speaking to an echo chamber consisting of fascists + those who are more neutral towards authoritarianism. You will reply to people, and wonder why so few ever reply back to you - but it won't be b/c they don't like you (well maybe some, I dunno:-P), and rather they won't even see your replies unless they happen to visit that section of the comments for some other reason. They can do so, but they will not be notified so they will not be made aware of your desire to communicate.
This event is happening, like it or not, and one way or another. This OP at least gives us the chance to talk about it, before things go too far and even this much communication becomes impossible. i.e., the Western world is offering you this lifeboat, to let you know what is coming. Truth Social surely does far worse, and when Elon took over Twitter and renamed it to X, he didn't warn people, and instead just started removing and banning at will/whim. But the rest of the Fediverse isn't going to remain associated with fascism just b/c some innocent people have an account on Lemmy.ml.
Btw, in your Settings under "Import/Export Settings" there is a large button Export that can make a JSON file, and in a new account you can Import it, for easy transfer of your settings. You'd lose all your past comments/replies/up-/downvotes, but if you also transfer your iconic avatar and keep the same name, many people may not even notice.