That's what a lot of sources in the US say, but, when they say, "drink", they mean "standard drink", which is this quasi-mythological beverage that one never encounters in real life.

I honestly think that it's negligent on the part of public health folks to continue the practice. Saying "Drinking more than 2 drinks in X time will cause you to be legally impaired" is actively encouraging people to unwittingly drive drunk in a culture when a typical ABV for beer is about twice what it was when those standard were originally calculated, and non-highball cocktails typically contain at least two shots of liquor.

"Unit" is so much better a term.