If you were trolling at that time (with more than one account) then we don't have any reason to trust what you say now.
I know DNA tests aren't reliable (not only in South America, but in all of Latin America of which Mexico is part despite
some Chicanos wanting to be related to the US) but scientific papers are more reliable than them, even though they might not be representative either.
And just for the record I'm not interested in competitions of who's whiter, Uruguay could as well be 100% European; the issue's that you clearly have a bias against certain countries that makes you disregard some professional studies and accept amateurish ones that fit your agenda.