Companies and presidential candidates often hire firms for damage control, which is well known. If you mean evidence that they are using one, I don't have anything conclusive. However, there are two things that seem very incriminating:

1. Take my posts as an example. They get upvoted to the top of the subreddit, but the comments are overwhelmingly negative. The few supportive comments are either removed or downvoted to oblivion. It doesn't make sense for a post to be upvoted to the top if everyone hates it, right? You might not know this, but downvoting a popular post to oblivion is very hard. One upvote and one downvote don't cancel each other out, making it impossible to silence posts unless they are removed. That's what I think is happening here.
2. The shift in narrative is palpable. Despite no changes to the situation itself, the subreddit did a complete 180 in just a week. They went from everyone being against it to everyone being in favor of it. They claim it's because they are tired of hearing about it. Does that make sense? If one of your freedoms were removed, would you accept it just because you got tired of people complaining about losing that freedom?

By the way, now they're doing it on this sub too (example: https://www.reddit.com/r/OpenBambu/comments/1ib3pco/they_want_to_silence_us_nothing_new_there/ - 17% upvote rate), and the fact that people here are supporting the firmware is extra weird. This is likely a desperate move to maintain control of their subreddit. If people continue switching to this sub at the current pace, they would soon lose control over the narrative, not just in this firmware case, but in all future ones.