What they said is still valid, and the point they were making aligns with yours.
We don’t know since that’s different for everyone - but we all agree at some point.
That point is, in our societies, the legally mandated limit of blood alcohol content. How many beers does it take to hit that limit? Without some specific knowledge of an individual, literally no one could say with any certainty. We could make generalities:
One beer over an hour, when drank with a moderately heavy meal.
But there’s no way to say “This is too many beers!” Because it is entirely a per person situation. Hell, some people wouldn’t blow over the limit and be so drunk they can’t stand up.
This is a very common term. I encountered it back home in Canada frequently, and just as much here in the UK.