First off, I think the spoken dialog
in which Mendez refers to "a half-Vulcan science officer named Spock" was merely a rhetorical way of saying, this is the exact same guy
as your first officer.
It's not racism because, in a truly post-racial society, nobody feels offended by offhand references to their extraction. On top of that, Vulcans aren't a race, they're a species, and the novelty of humanoid cross-species hybridization was Spock's claim to fame.
Then I think the prop document was written with two references to that unique-to-Star-Trek
phrase as an in-joke, in that it exactly quotes the dialog. It wasn't meant to be readable on TV.