You could make it look organic by starting some VPN countries all over the world and feeding your bots via those.

Also your point one has a huge flaw in my opinion - if I were Russia my top priority is to stay hidden and secret, everything you say opposes that, each time you introduce a new human element that is not loyal with certainty (forced or willing) is a weak point, even more so paying hosting companies in other countries that aren’t under direct control. I wouldn’t upload a bot that I wanted to stay in control of to another hosting company without some real knowledge that the bot (and that my control of or connection to) couldn’t be traced back to me in some way.

Also, the article shows examples of engagement reduction on certain Twitter accounts, no idea if that is cherry picked or just a coincidence.

I don’t have Twitter and I have no idea if there is some kind of database of recent engagement metrics, or if I did find one - if it is trustworthy.

How are you determining right wing communities are not having any change in engagement (genuinely curious since I have no idea how you know this).