I don't know, but I would assume my therapist drinks alcohol, yes. Here in the UK, and in most of Europe I think, almost everyone drinks. It would be very unusual for an adult not to drink alcohol at all. Some people don't because of religious beliefs e.g. Strict muslims, or because they are recovering alcoholics.
I don't see it as a dichotomy between "someone who drinks" and "someone who is sober". A very small proportion of those who drink alcohol will go too far and binge drink and make themselves ill. and an even smaller proportion will have a problem with addiction. The majority of adults drink alcohol socially and for relaxation and social occasions, and I assume that my T does too.