When I saw this topic, I wanted to say that Bitcointalk is already blocked in Russia for long time already, but theymos was faster than me. To be precise, it happned in March 2020:
https://bitcointalk.org/index.php?topic=5235976.0That tweet in OP was fake news, so far they aren't going to disconnect from global internet. So far they are just making big scale censorship. First they blocked all opposition websites and TV. Then they started to block foreign websites, social networks like Facebook, Twitter. On Monday they'll block Instagram and most likely Youtube next week. But wouldn't be surprised if Cheburnet soon would turn into reality, considering in what direction Russia is going. They're turning into huge North Korea.
Many Russians is looking for VPN's now, problem that with not working Visa/MasterCard they can't pay for it. Bitcoin is one of few alternatives available.
It is quite clear to me that Russia is moving in the direction of more or less isolating itself from the EU, UK, US, and countries it considers hostile - but doesn't a complete internet outage do incalculable damage to their economy, far greater harm than any benefits of such insane isolation?
Offcourse it makes more damages than gives benefits. Actually, it's difficult to find benefits in complete isolation besides censorship. But it's difficult to find much logic in Russia actions now which is simply killing their economy.