There's a lot of ancedotes "I've seen hatespeech drop" etc. This is measurable and there are people measuring this kind of thing. Let's wait for some real data.
My guess would be that there will be a significant change detected but Russian troll farms are not totally datacenter operated - it's still mostly ran by real office workers like in 1984. That being said, you still need datacenter compute for organizing even manual operations like this.