Your ISP can see that you’re sending encrypted data back and forth from your VPN and that’s it.
Your VPN can see what you’re doing (including torrents), but part of the service that many VPNs advertise is that they don’t keep logs. If they kept logs they’d have to hand it over to law enforcement upon request, and if customers started getting caught then word would spread and no one would want to use that VPN. So they are incentivized to keep their promise not to log, and if law enforcement complains to the VPN about customer activity, they can honestly say that they don’t have any logs to give them. There’s no law in the US that requires logs.
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