>

The point is that reddit eliminated the places where it was appropriate to discuss them.  There is nowhere on reddit transgenderism is discussed without walking on eggshells, because the subs run the risk of getting banned if they don’t heavily moderate the discussion.  Even, for example, r/4chan heavily censors it.
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I have a dummy account I use to test mod stuff, and just now I used it to confirm that a message must be sent to a user when they are banned from a sub. It is not possible to issue a ban for what you describe, or for any other reason, without messaging the banned user.
Since Reddit requires a message to be sent, even if the subreddit doesn't want to send one when it bans you, it's safe to assume that this does not violate the harassment policy. >

Why would you ban someone for posting in another subreddit though? >

The "why" is easy.  Because it makes moderating some subs easier.  Let's say I run a Pro X sub, and people from the Anti-X sub keep showing up and harssing people.  I can pre-emptively have a better experience for my user by not allowing anybody from the anti-x sub from posting.
If you think that is right or wrong, that's a different question, but the "why" is "it pre-emptively bans a number of users who you would have to ban anyways" >

A cynic might also point out that it helps create and enforce a certain ideological homogeneity that has become a defining feature of post-2016 Reddit. >


it helps create and enforce a certain ideological homogeneity

Yes, exactly.  The subreddit for trans people to talk about trans people things is not the place for anti-trans people to come debate whether trans people's gender identities should be respected.  If you want to argue about that shit, take it somewhere else. >


If you want to argue about that shit, take it somewhere else.

Where? There is no where else to take it, at least not on this site. Subreddits like r/gendercritical were very careful about enforcing site rules, but they were still banned because it was a feminist sub that disagreed with Reddit on trans issues. >


Where? 

Not my problem.  It's discussed in a number of subs on a regular basis. This one, for instance. Not in the trans subs.  That's not what they're for.