Private trackers are no more “secure” than public aside from the barriers to entry… However, it’s not like someone working for the MPAA couldn’t pass an interview or whatever it is they do these days…
I’d still use a VPN if I were still on private trackers.
That said, I use a VPN always, so… 🤷🏻
Just use mullvad. Pay for it with Monero if you’re super paranoid.