The whole thing seems remarkably amateur and low effort. Their slide of limitations is revealing - lack of language skills, no real process for handoffs over vacation times, use of a dedicated URL shortener that only GCHQ use instead of the many commercially available ones - these seem like basic errors. I find it hard to believe that this was a well funded effort or even achieved much at all.
It also casts some new light on the "Russian bots are taking over" establishment meltdown. Projection much? Obviously western government figures know their own staff are doing this sort of thing, so they assume that Russia is too and the lack of hard evidence of the type shown in this talk is neither here nor there.