And what about something liker a Trezor hardware wallet? They now have a built-in service called "coinjoin" which in my view is nothing else but a mixer. So will anything about Trezor also be banned 
Here's your answer:
... Examples of things that are not banned mixers include exchangers (unless they have a mixing function), CoinJoin-supporting non-custodial wallets, and Monero.
So unless Trezor explicitly markets it as a mixing service, that's when it is no longer allowed. Otherwise, it's good to go.
More and more things are getting censor in the forum as long as government dislikes them. This means sometime in the near future, the number of things we can freely talk about and link to will be tiny.