Deal with it, Ninja Gaiden and Nioh aren't DOA related either. You act as if this forum is the only fighting game forum that has other games as threads for discussion. But yet it's OK for you to make a thread that makes cheating on DOA5LR PC easy and virtually accessible to anyone by using a regularly updated bot.
If DOA 5 had just been released I would be somewhat disappointed in the lack of focus on it. But after this much time there isn't a lot of new tech the average person is going to discover and you need things to talk about. This is what is necessary for a healthy community.
There's honestly nothing wrong, I've noticed that discussion in any FG forum in general is more active when there's new characters, stages, content, etc. When Naotora and Mai were released the forums were active for them with people presenting findings, but because they're skillgates and time has passed, there's nothing really left to discover until someone finds something.