(edit: oh, sorry, i thought you were doubting the quoted text, but you were actually using it as evidence to support your argument. my bad. if you delete your reply, maybe i can delete this comment too)
my old comment for reference:
you doubt what? the claim they are filing is that luanti violates the copyright. that's the point of filing a DMCA notice. that means they are alleging that luanti infringes minecraft’s copyright. what else could it be?
I see the quotes are misleading. I doubt the parent's suggestion and was providing the article quotes as justification. I've edited it now.