Laws that are designed to help you but you can't easily access, or laws that are designed to control/restrict you and that get shoved in your face: once you manage "consumption" of laws, you can push your agenda too.
I agree that you would have to believe something like that to make sense of what it's implying. But by the same token, that very contention is so implausible that that's what makes it rhetorical overreach.
It would be ridiculous to suggest that anyone's access to published legislation would be threatened by its deprecation.
This is probably the part where someone goes "aha, exactly! That's why it's okay to be deprecated!" Okay, but the point was supposed to be what would a proponent of XSLT mean by this that wouldn't count as them engaging in rhetorical overreach. Something that makes the case against themselves ain't it.
At least, this is how I read that part.