Obscure torrent: What seems like only seeder only connects for about a second, updating my "last seen complete" every 5 minutes or so, without transferring any substantial data. Thoughts?

Sorry if this is a rookie question, but most of what I've downloaded over the last decade was nowhere near this obscure. I'd like to think this community could benefit from a corpus of Q and A, if this breaks rule 4, I'll gracefully accept if this post is removed.

I am downloading through Mullvad, which I know doesn't let you forward your ports. So I can appreciate that that seeder's settings and mine might not be super compatible.

Is there any flag or anything I can do to let the seeder connect at all, besides finding some other way to exit with port forwarding. Seedbox is on my horizon, but it is far out there.