This isn't really true, technically or otherwise. The Alston ruling was actually pretty limited in scope and focused only on NCAA restrictions on "education-related benefits". It had nothing at all to do with NIL. If anything, the ruling seemed to endorse the ability of a University to pay a player anything that it could reasonably deem as related to the education of a student. According to the SCOTUS, a school should be allowed to pay a student 100k a year for a summer internship if it so chose.
The problem is that the Alston ruling set the table for declaring practically any restrictions on players as being in violation of the Sherman Act.
The changes to NIL were actually part of a movement to allow NIL by various state legislatures that has been going on for a while. But it became apparent after the Alston decision that the NCAA would be unable to enforce NIL rules at all, in any way, that limited athletes ability to benefit from NIL deals and so they essentially just gave up the fight on NIL knowing that they would lose again if anybody challenged it.
The rules that you are talking about were part of the new guidance released by the NCAA and its members. Those rules can only apply to the individuals schools and are also subject to state laws. So while member institutions "may be" prohibited from paying players or directing the payment of players, they cannot, in any way, interfere with players NIL deals.
The idea that it can't be related to on field performance is false. You may remember that one of our players had a deal that provided free cookies for every interception, or something like that. There are tons of deals that are based directly on an athletes performance.