The headline is misleading, in that “schools” are considered different from colleges.
The problem is that colleges were identified as ‘Catholic’ decades ago, and generally retain that designation even if they are mostly secularized.
Even if a Bishop isn’t thrilled with a local college, he doesn’t want to give up the slight influence he still has, by declaring it no longer Catholic. Also, the local media and a Religious orders may trash the bishop .most bishops have too many other struggle going on now.
What the Church should do is designate a college or any institution as Catholic for a ten year period. At the end of that time an assessment can be made, to recertify for another ten years…or not.