You can safely think of it like this;

Addresses are containers for bitcoin, wallets are containers for addresses.

There are some variations, but this is a pretty safe starting point.

Therefore,

when kyc is associated with an address, that address is toast forever as far as anonymity.

But, hypothetically,

if one address in a wallet has been associated with kyc, that does not necessarily mean every address in the wallet has been. It would depend on what transactions have gone in and out of each address, and what kind of metadata that particular wallet is collecting, or leaking.

It depends on your risk profile, and what youre doing.

If youre looking to stay anonymous because youre an international terrorist, bitcoin and coinjoin probably isnt enough. Also fuck off.

But if you're just trying to protect your personal sovereignty and constitutionally guaranteed 4 amendment rights from institutions which are criminally violating them daily, you MIGHT be safe depending on what your hardware set up communicates to its parent company. That is what i would want to know, is what data is being sent to the parent company, if any, before i chose how to proceed.