That’s a common thread across other instances of this legal argument and again on it’s own is considered insufficient.
It all rolls back to article III section 2 The Judicial Power shall extend to all Cases, in Law and Equity, arising under this Constitution
The legislature is often assumed to have a great deal of power, but it was intended to be relatively weak just like the other two branches of government.
Well, the interesting point of law here is that the Constitution specifically delegates the authority to the legislature. So in this particular case it may indeed be as straightforward as saying that the legislature was bypassed and didn't authorize the changes. At least that is my understanding of the case so far.