This post in an active part of the forum got 1K views in a little under a month. Out of those views only 28 decided to reply to it. The OP post only got 12 likes. It took nearly three years for
this post by the literal owner of the forum to get 30 positive reactions and 28 replies at the time I'm writing this, in a slower part of the forum. And you can click on the reactions yourself to see how spaced out they are over time. If you go onto the main page you can see a list of registered members, people who can actually use reactions and reply, that are active at any given time. There's 27 of them online at this point, myself included. I don't know what kind of "masses" you're expecting to suddenly show up in waves to false flag posts but I don't think they're here in this niche forum. This is not X or FB.
If you're still worried about people bombing some post with negative reactions, go click on "What's new > Latest activity" and see how often people dislike a post. You'll quickly realize people are much more likely to like a post they enjoy and leave no reaction on other posts than to dislike a post. My point being, the data doesn't support this concern being that pressing of an issue.
There is already a dislike and troll reaction, like I said earlier. If someone were to come here and start posting nothing but nonsense or act in bad faith people would both report them and react negatively to these posts. Why do the public reactions matter if theres a report button? Because they signal for everyone else looking at the thread that people who are engaged in the forum actively like or dislike these person's posts. With the reactions we actually get to measure how the actual posters of the forum feel about it. It's valuable information for seeing who's trusted in that space and who's not.
You might then ask "But doesn't a bunch of people reacting negatively to someone's posts make that person stop posting and coming to the forum eventually?" Yes, that is how members in that community get to push out members and ideas they don't like out of their space over time, without having to involve moderators. This is a process that happens everywhere online and offline. Curating a space is not just the job of the authority figures in that space, it's partially the job of everyone else that's participating in it.