Not really. Arguing against the Kantian principle is not arguing against Rawls. A separate argument is required. Your prof seems like a dime store sceptic to me
He was arguing against Rawls' conducting of the experiment and 'rigging' the result to his conclusion. Treating people as ends in themselves doesn't mean the veil of ignorance. So the veil is not the Kantian principle, but Rawls' interpretation of the Kantian principle.
Dime store skeptic, he's not. If you don't buy the veil (I for one, do not), then you won't buy his Theory of Justice.
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