That's true, but there's no reason Twitter/X has to stay like that.

Stack Overflow has a pretty good model. It does not remove suspended accounts nor their posts (except those directly related to the suspension). It subtly signals that an account is in suspension by reducing the account's 'reputation' (internet points) to 1 and placing a small notice on the profile, usually stating the reason for the suspension (e.g. suspicious voting etc).

Those platforms have not, however, been billing themselves as champions of unfettered free speech before handing out arbitrary unexplained bans when their feelings got hurt or they disliked the speech.

Companies market themselves in ways that disagree with how the companies operate all the time. Marketing is frequently misaligned with what the company or product actually is.

So your take on it is "oh he's a hypocritical liar but it's OK because he's not the only one"?

No, you're putting words in my mouth. My point here was simply that we should take any marketing as an accurate view of reality.

Pick a company and you will almost certainly find contradictions in how they publicly represent themselves.