I'm not talking about them checking his internet usage. I'm making a more general point that it seems very unlikely that nobody within the organisation could make the link between him and the white powder given it's easy to tell when someone is on it and further incidents of suspect behaviour.
The Klopp video of him spaced out was several years old, and nobody inside PGMOL had any idea of this side of him - come on. He was suspended for several months in 2017/18 for alleged misconduct with PGMOL claiming his absence as "an injury" hiding the fact that he was being investigated. The nature of the allegations weren't made public.