Worth to keep in mind that Bellingcat is believed by many to be closely linked to MI6, so take their publications with a grain of salt.

Is there any evidence of that?

"is believed by many"

He already said no.

No direct evidence as you would expect. We only have circumstantial evidence such as selection of topics to cover and general view regarding covered events, which align quite well with position demonstrated by intelligence services. It also has some questionable funding sources (e.g. National Endowment for Democracy and Integrity Initiative), but I would say it also nothing more than circumstantial.

One recent analysis of Bellingcat behavior (not in general, but using a selected case) can be seen in this video (in Russian, but it has good English subtitles): https://www.youtube.com/watch?v=uDhhCLyYCU4 Author of the video is a Ukrainian opposition leader, who fled the country during Yanukovich rule, got asylum in Europe, and since then lives there.

Haven't watched the video, but is it from Shariy? If yes, then you wildly misrepresented him.

How so? I wrote only factual, easily verifiable information about him.

If someone does not want to judge by the video content alone and wants to learn more about the author, you can read the following wiki links:

https://en.wikipedia.org/wiki/Anatoly_Shariy

https://en.wikipedia.org/wiki/Party_of_Shariy