As Kevin said, KMEM is not a native P3D4 scenery, it was originally made for FSX/P3D3, it was released about a year before P3D4 came out, which first introduced Dynamic Lighting.
And on the same day it P3D came out ( June 2017 ), we released KCLT, which used Dynamic Lighting before everybody else. All our sceneries released after that ( KORD V2, KSDF, LFSB ) and all our sceneries for MSFS 2020 too, all use Dynamic lighting, since they were designed for simulators that have that feature.
After we'll release KCLT and KIAH for MSFS, KMEM is one of the most likely candidates for a remake in MSFS, which will of course feature full Dynamic Lighting, which is far better performing in MSFS.
In any case, I'm sure you'll find lots of features at KMEM that nobody else has, which are all still unequaled this day ( try to take the elevator inside the Control Tower in Avatar mode, for example ).