Read the full decision.
My tinfoil hat theory is that the district judge did not want to be responsible for keeping trump off the ballot, be it safety for her/her family, or that it is such a momentous event that she did not feel comfortable bearing that weight alone. So she came up with this “not specifically references” conclusion as a soft punt to the state supreme court.
Makes sense. Had it been just her that ruled against him, Trump would’ve cast her as an activist Biden puppet. But now that the Colorado Supreme Court ruled against him instead, it’s harder to paint that picture.
Still, I don’t like the idea of judges being intimidated to rule in a way they know to be incorrect just so an appeals court can take the blame.