1984 is in very large part about historical revisionism. If anything, the term "holocaust denier" is the opposite of Orwellian, in that it specifically stigmatizes revisionism.
I'm sorry, but calling a holocaust denier a denier doesn't stigmatize inquiry. There is no "both sides" here. The holocaust is a fact, documented by many first person accounts on both sides as well as physical evidence, much of which can be experienced by the remains of several of the camps.
You could debate some of the numbers - was it at the lower end of the estimate or the higher end, but pretending that there is any legitimate reason to claim that the holocaust didn't happen is denying fact.
Yes it does. Does Amazon remove "the earth is flat" books? Anything is up for discussion. Does Amazon remove "humans should be able to have sex with animals" books? I'm sure theres at least a few. Thats the principle of free speech. Claiming "heresy" and lashing out violently is what children do. You dont have to buy the book.
1984 is in very large part about historical revisionism. If anything, the term "holocaust denier" is the opposite of Orwellian, in that it specifically stigmatizes revisionism.