There's a very good reason that people going to Snopes for claims originating in such sites aren't redirected that way, and that's because the claims often get separated from the originating site as soon as someone believes them and decided repeating them as original(or in the form of an unsourced meme) is the best way of sharing them.

Of course, the Snopes article on the claim should mention the satirical original source, but that's no reason not to do everything else Snopes would normally do to address a claim about which they have received questions.