That’s pure conspiracy thinking. Their service has been more or less blocked countrywide in Russia multiple times in the past, without too much success. Pavlov Durov has been publicly anti Putin since 2014 and exiled himself following euromaiden. Telegram has never been a Russian company, it was Berlin based, and is now in Dubai.
All of this has been public information since years, there isn’t any proof of anything malevolent happening with the service.
Or did I get that wrong?