Coinjoin doesn't require near as much user participtaion requirements, you have to have entities (DEX, CEX, POS, etc.) recognize transactions for it to be usable.
From Discord: XKCD
I am unable to log in, still in degraded mode, but you might want to suggest to him `keypoolrefill 10000` Otherwise he will need to dump his wallet and re-import it into a new one.