Orwell's imaginary "Newspeak" results from a totalitarian regime's edict to minimize the English vocabulary, make the public dumber by erasing important shades of meaning, and promote blind acceptance of all government policies, no matter how sadistic, irrational, contradictory, etc.

So, by no stretch of the imagination is "homophobia" an example of "Newspeak," in "1984" or anywhere else.