FSLTL has only ever been developing software/addons for Microsoft Flight Simulator so far.
While you are of course welcome to request that they port their software to X-Plane (with them directly, as, other than getting some data from them, FSLTL are not in any way affiliated with Navigraph), I would not expect them to do so, and certainly not quickly.
The software development kit and the file format used for the 3D visual models required for traffic injection are completely different for MSFS and X-Plane, so “porting” FSLTL from MSFS to X-Plane is akin to starting from scratch, for the most part.
Regards,
Tim