moritz comments on Harry Potter and the Methods of Rationality discussion thread, part 16, chapter 85 - Less Wrong Discussion
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I dimly recall that in canon, Squibs are actually the children of two wizards. That contradicts Harry's finding directly.
But then Rowling probably didn't have any rules in mind about how magic inherits, so it might be impossible to come up with a good theory that explains everything we know from canon.
I had always assumed squibs are caused by point mutations.
If Harry's theory is right, squibs can't be normal genetic descendants (mutation not withstanding) of wizards, but adultery is a very real, very common thing. Cannon does not rule out the possibility, though given that the books were meant to be accessible to children it's not surprising that Rowling doesn't go into detail on the matter.
Here's a new one.