It's not meaningless in general, but it's meaningless for the purpose of deciding that they shouldn't see the basilisk because they'd misunderstand it. They don't misunderstand it--they know that it's false, and if they read the sequences they'd still know that it's false.

As I pointed out, you could still argue that they'd misunderstand the degree to which the basilisk is false, but I've yet to see anyone argue that.