LVM-Thin blocks boot, and now is missing

I think I somehow misunderstood and misconfigured LVM. I come from Windows and went straight into ZFS Fortunately only unimportant VMs are on that disk but any help would still be highly appreciated. Here is what I did:

My system uses two NVME mirror ZFS drives. Later on, some friends and I wanted to have a LinuxGameServer for Minecraft and stuff. I don't play these games but thought, sure I will just add another HDD and explained to them, that nothing is saved! This is my slow trash...

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