Q: Will this package keep my adjustable air suspension working?

Yes. The lowering kit is designed to maintain your Dynamic Air Suspension while letting you sit lower, giving roughly 0.75 inch of additional drop per setting rather than removing the air system. You keep the factory ride-height adjustability and simply lower the baseline. That is the appeal over swapping to coilovers: you get a lower, better-handling Model S while keeping the convenience of the factory air suspension.