Loudspeaker monster?

Has anyone anyone ever seen this before? I already looted this area and come back to find this thing cursing and warning humans to stay away. I played this awhile and never seen this. Its kinda weak good for annoying zombies but I already cleared most of them

I raided that dojo before already and then this shows up. Never seen wonder if I just missed foodperson during my raid

It if it what I think it is, then it’s an anti zombie trap placed by a surviving human. However, I haven’t found any survivor nearby the very few times I’ve encountered the trap (once?), so I suspect it isn’t a “tech savvy survivor nearby” indicator (unfortunately, as that would be cool).