A bunch of speculative research by anonymous third-party sources in a Russian-language paper with little journalistic cachet is your evidence?

We should refrain from ad hominem statements and stick to the merits of the argument. Personally, I agree with GP that Meduza doesn't really inspire confidence in its reporting here.

I mean it’s no cnn with their incredibly high standards i agree ;) also did you notice many links to other sources?

All I see in this article is a bunch of "anonymous Twitter detectives said so-and-so". This does not feel like reputable investigative journalism to me.