Yes, you're right, because in fact the CoinJoin protocol is centralized
No it isn't. CoinJoin is neither centralized nor decentralized; it is simply a protocol. Wasabi's implementation of it is centralized. There are other better implementations, such as JoinMarket, which are decentralized and are not pro-censorship and anti-fungibility like Wasabi are.
so speaking of anonymity, Trezor developers get an additional tool for accessing the list of users and their IP, as well as the possibility of blocking.
I've got to question the smartness of submitting addresses from your hardware wallet directly to a blockchain analysis company for surveillance and monitoring by using Wasabi, especially since Trezor (if you use their software) can link all the addresses in your hardware wallet together. Sounds like a nightmare partnership for privacy.