This is the key here. What the NCAA is saying is that the transfer portal responsibility is mostly on the university - NOT the student-athlete.
Lucas could unenroll from UW and then reenroll from another university at any time, and that was his right. His only obligation was to inform the school (in writing during the proper period) that he wanted his name entered into the portal.
The university, however, was obligated under NCAA rules to enter him into the portal, and within two business days. They neglected to do so because they decided that under the MOU, Lucas was not eligible to transfer. However, the MOU says that NCAA bylaws supersede the MOU.
This is all a separate issue from the MOU enforceability, of course. But it seems that either way, UW did admit in their statement that they violated an NCAA bylaw here. So the portal does exist, AND is there to prevent schools from doing EXACTLY what UW tried to do to Lucas. It is meant to prevent schools from restricting the freedom of the athletes and making sure that the school CANNOT bind them to non-compete employment contracts.
Which is why it will be VERY telling to see how the NCAA handles this.