it seemed like every argument he made was backed up by citing previous cases
That's pretty much the pro forma for decisions at this level. To appeal it, the other side now has to prove that he was either a) wrong on the facts (rare at the appellate level as they don't review facts, but simply take as fact the evidence in the trial) or b) wrong on the law. i.e. That his reading of what those cases are saying is wrong, or being applied in an incorrect manner. The fact that he made two separate rulings - one on due process, and one on equal protection - means they now have to argue each one in the above manner. And, to get it overturned, they are going to have to win both, as finding that it does not violate due process but does violate equal protection (or vice-versa) still leaves it unconstitutional.
As it is, this is exactly what all the state courts who have looked into it said - that it either violates due process, or equal protection, he just said, 'yeah, you're both right.'