Would it, though? The bill appears to be based on people wanting to change their current gender without any medical oversight. So, while I don't particularly care if someone who is genuinely intersex(IE, their true sex is so ambiguous it can't easily be determined by a doctor) has their sex declared non-binary, 1. That applies to almost no one. A much smaller percentage of even people considered 'intersex' for whatever other reason, and 2. We know that's not the reason this bill is being put forward.
I can't see how this would be useful even to the few intersex people that might want/deserve it... wouldn't it just cause more legal confusion for them? To what end? Presumably most were raised as one sex or the other, which should still be considered their 'true sex', regardless of what genetics shows.