I'm skeptical. I don't see how there can be a meaningful difference between a regular-strength sixteen ounce beer and one shot of regular-strength vodka mixed in with slightly less than sixteen ounces of water. [0]
I do agree that -because you're drinking far less fluid- it's far easier for those who aren't monitoring how much they drink to get massively intoxicated when drinking liquor rather than beer or wine.
[0] ...other than taste, that is. Sixteen ounces of dilute vodka-water wouldn't be a joy to drink.