The dodgy IPTV companies employ the same technology as Netflix etc... You're probably aware that Netflix know exactly what their subscribers have streamed and when (VPN or not). So the only question is have the police managed to access the relevant records of the illegal IPTV operation, I think...
I don't think the police are that bothered about chasing people watching dodgy football streams over a VPN.
The original article says it's an ongoing investigation with FACT (primary focus on Film and Television rights).
I suspect the Police have busted one of these IPTV companies that provide...
Been illegal since 2018 I believe, changed the law so it included temporary copies, which was the get out before.
https://crimestoppers-uk.org/keeping-safe/online-safety/streaming-online-know-the-risks