Yeah, sounds like you’re running into FRP (Factory Reset Protection), which kicks in when a Google account was previously synced to the device. Even a factory reset won’t bypass it unless the original account is removed first. If the seller can’t provide the login or remove the account remotely, you might be stuck. Hopefully, they respond soonthere’s not a legit workaround for FRP without the original credentials.
I imagine it’s possible. Those are just standard Android tools that likely work on any tablet. Personally have not used it on the LP2, but I remember seeing someone do this with ADB (I think on the command line) with a Samsung tablet or something, so may be possible.