Mixers and chainalysis

Hi all,

I haven't followed in detail how things have developed in recent years with blockchain forensics, and in particular the degree to which mixers are still capable of functioning as desired. To what degree are organisations like Chainalysis (or any average joe) able to use block explorers and related tools to know what has happened with coins before and after they are mixed?

Is it possible currently to "de-KYC" one's coins if purchased on a CEX using a mixer (or perhaps combination of Monero and a mixer)? Or is this a thing of the past?

Are there also risks in being in possession/using coins (whether KYC or not) that have ever touched a mixer, whether one used the mixer themself or not? I am just thinking that it is always possible to know using block explorers if any sat has ever passed through a mixer, and this could then 'flag' that (and any associated sats it later gets lumped in with).

This is something I have wondered about for a while but found it quite difficult to find an easy to understand explanation of where things are at, and maybe how it has changed say over the past year or two.