DEXes still don't ask for kyc, do they? I haven't come across any that require KYC at least. CEXes have got no way except to comply with regulations to continue functioning.
Once a DEX is requiring for a KYC then it is no longer Decentralized again but a centralized exchange, I have come across many exchanges in the past that were not KYC must exchanges and many treated them as on but as time goes on they switch to partial KYC and then to Full KYC example of this exchange I can remember is the KuCoin and OKX exchange is later switch, so if they actually ask for KYC they seize to be decentralized again and that’s why you see Kycnot.me actually delisting some of them from its platforms.
Regarding bold part, which?
I think he meant decentralized exchanges that do have their own personal wallet with seed phrase and an example is BISQ exchange. This is common now with even centralized exchanges having their own wallet with seed phrases and private keys giving out