Maybe (but you can still buy booze illegally after 11pm - or at bars). I think it's more or less greatly improved economic conditions and improving quality of life. The 1990s and early 2000s in Russia (Belarus & Ukraine as well) were seriously dire. I was surprised by how many people didn't drink in my travels there. A good movie to check out on that time period is "Brother" (Brat).
Alcohol consumption is down significantly there and has been on the decline. They’re not even in the top 15 countries who consume the most:
https://www.theguardian.com/world/2019/oct/01/russian-alcoho...
https://worldpopulationreview.com/country-rankings/alcohol-c...