I doubt this will affect regular users but there is a possibility they could try to shut down this forum. There is already a similar precedent when Deep Dot Web was seized by the FBI. It would be an overreach for them to go this route but if they really wanted to shut down BitcoinTalk this would be their best opportunity. As far as I'm aware Chipmixer didn't advertise anywhere else besides this forum.
I never contemplated a scenario before where this forum could be viewed as a problem by any governmental agency but now that you mention it, would it really be a surprise if they seized the domain and shut down the forum?
This is highly unlikely. The forum was just a means of communication used by ChipMixer, nothing more.
Furthermore, the forum administration has no connection to ChipMixer.
The worst that could happen (if it hasn't happened yet), is for the authorities to request information about the user who allegedly represented ChipMixer here on the forum.