Honestly, I think it's too bold to poison the most popular opposition member even for FSB (Russian FBI). So who knows maybe the person who started it doesn't belong to Kremlin.
There are plenty of KGB troll accounts commenting on this story. They are now most active as they have to do their job of discrediting the story and direct the narrative towards doubt: eg false flag, etc
But the evidence is staggering and it obviously doesn’t work
If you were in Russia you would know that it's not true) Most of FSB are really stupid and old fashioned. These people very far away from Tech, especially top officials. I'm not a fan of Putin either and truly believe that Russia deserves much better president with more liberal views (in a good way of course).