Also outsider (like it matters).

> The screenshots are literally Minecraft screenshots.

Irrelevant to the DMCA claim.

> It's a clone, and not a subtle one either.

You are incorrect. Luanti is not a minecraft clone. It's more akin to Godot. I can import Minecraft assets into Godot, but it does not make Godot a copyright violator because of my actions.

> To call this "Baseless" is hilarious.

I would say it's justified.