(As to what that particular persons state is I cannot say.)
Re-posting a post I did in the past:
When it is excessive there is sin. When drinking is contrary to temperance or health etc.
Examples of when drinking is grave sin (mortal sin) would be - getting “drunk” -that is -total loss of ones reason, drinking leading to other mortal sins, drunk driving…
Going beyond temperance can be venial sin (I set aside any question of driving…that brings other aspects into things…but suffice to say let someone else drive). Going beyond temperance in eating oreos too is a sin.
But what is temperance for one person may not be temperance for another. Body weight etc can come into play here.
I know for example that I ought not have more than two drinks (and not more than a few oreos!). Now someone else will say that about one drink. Someone else will say 2 1/2…
So can it be the case that a person on some occasion has a nice glass of wine (or other reasonable drink) to relax or as part of dinner or part of good recreation with friends etc - knowing that yes there will be effects from the alcohol- without sin? Yes.
(And one ought to look a new research as well in terms of health as well as the effects medically on a person of such and such a weight and it varies according to gender too - of how long it takes for the body to remove the alcohol.)
(And of course a person with a history of overdoing it -ought to take great care - and if any have say alcoholism - that is a “never drink” situation)