Yeah, that's shitty, and it's no excuse, but I understand that, as a company, Proton will still have to comply with Swiss law, and if Swiss law requires IP Address monitoring in "extreme criminal cases" which I doubt Proton has the ability to decide whether it fits that or not.
I saw in the article that Proton also offers an onion address, which will make the IP Address monitoring useless anyway. So they, legally, have to do the monitoring, but provide a tool that makes their "monitoring" useless.