I think he's saying that all VPNs that do port forward will interest governments/police and the ones that are still operating are probably only operating because they got a deal to not be prosecuted in exchange of letting those entities see the traffic. Mullvad being Mullvad, they will never do that so instead of having all those legals threats, they just shut down the port-forward service. Tbh I'm surprised it ran as long as it did.