High network quota usage even for less than 1 min play

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Portainer I understand, I run it myself. It's the other data you provided that's slightly confusing (to me). The logs don't indicate multiple connections which is the odd thing. I've not seen the message about the default method for recording playback stats being "delete" before either... Is your plugin working okay?

I'm not sure I can offer anything more of substance to you other than to point you towards a) enabling debug logging to see if you can get more verbose output out of Jellyfin and/or b) using something like Wireshark (I think that's the right tool, networking isn't my thing could you tell?) to snoop all the traffic coming and going from that VPS or at very least the container. If you use your containers the way they're supposed to be used, it's disposable so installing Wireshark on there for a bit to monitor and then recreating it after you've identified the issue shouldn't be problematic.