Earlier quoted context omitted.
If you look at the screenshots of the game in question, it's pretty obvious what is going on https://www.luanti.org/en/#gallery Even though those are mods, it's a bad look to be holding those up as reference game images.
Um, why? Because they both have blocks? Is Microsoft the only company allowed to use cubes now? Even if they were similar, artistic style is not protected under copyright.
So with a straight face, you think a jury wouldn't call this Minecraft?
https://www.luanti.org/media/gallery/5.jpg
Also Luanti probably could doge all this if they just ditched all the blatant minecraft clone mods. A mining game with blocks is totally fine. If you look back at infiniminer, it's clearly a different vibe of the same concept.