I'm sure I'm wrong, perhaps not... I think I heard somewhere that competitors can wear supershoes at NCAAs because the NCAA's a law of its own.
I checked the NCAA rules and it seems that you can wear any stack height.
NCAA rules wrote:
The soles of shoes used in the High Jump and Long Jump shall be not more than 13 millimeters thick. The heel of shoes used in the High Jump shall be not more than 19 millimeters thick. In all other events, the sole and/or heel may be of any thickness.
But I saw a bunch of other amendments separately where the NCAA made adjustments to align with World Athletics rules (but not about shoes).
But if stack height rules don't apply, wouldn't that invalidate all WA-eligible performances? Just for people wearing invalid shoes? All the results from NCAAs seem to be on WA website, for eg Dylan Jacobs.
disclaimer I am not a lawyer, a journalist, or any form of expert