Thanks for the information. I guess that's less confusing in retrospect but the wording of permissible to me is initially confusing because to me that means allowed. For those that are curious on a more thorough understanding of this, here is a response I received from AirMap.
The altitude restrictions you see for US airports in controlled airspace are simply a guide to use when requesting authorization from the FAA. The FAA may be more likely to approve flights under those stated altitudes. That is why the language (provided directly from the FAA) states the flight is permissible (when authorized) under that altitude, rather than outright permitted. You must still apply for authorization.As of today, automated authorization through the AirMap app is available at these FAA Prototype airports using the AirMap mobile app. Airports will be added in the future as they are authorized by the FAA.For all other airports, you must continue to use the traditional process of requesting approval through the FAA Web Portal.I hope this information helps! Please let me know if you have any other questions or concerns, we are always available to assist.