This is literally just a package, just like the SS 1LE. Transfer the data over to the original MY2018+ GT and delete this clutter of a page, please and thank you.
The base GT (equivalent to Camaro LT1) and PP1 GT (equivalent to Camaro 1SS and 2SS) are faster as well in most metrics.
https://fastestlaps.com/models/ford-mustang-gt-mk-vi-facelift