I would agree due to two things… The willingness to jump in assertively to existing threads, and the comfort/familiarity they seem to have. Maybe they are a long-time lurker or just have an assertive personality though.
However, I’m not so sure about the “trolling” part. They aren’t acting particularly offensive or controversial. They did challenge some people about discussing Covid-19 statistics but weren’t totally sealioning or saying anything crazy. And they backed off and apologized after offending someone in this thread. So if they are trolling it is pretty subtle to me.