Those letters were written in old Castilian not modern day Spanish the Brits used that and made propaganda about him and the spanish crown.
So if they had been written in Modern Spanish 500 years ago the Brits wouldn't have used them?
Ofc not all was false.
And the stuff that isn't "false" by your standards is enough to say Fuck Columbus.
A good example of a terrible person with letters in modern day English is Ghandi
https://en.wikipedia.org/wiki/False_equivalence
Gandhi, I am assuming is who you mean you do spell it two differing ways neither of them correctly, may have been all those things, but no matter what Gandhi does, it doesn't make Columbus any better or worse as they are separated by hundreds of years and totally different circumstances.
Well leave the native American were scary fuckers them sefls to each other they also wiped each other out.
Unlike your murder of the English language, Native Americans did not "wipe each other out"