Blender Addon - "GlobalSkin - Metahuman" User License?

The “GlobalSkin - Metahuman” addon as far as I’m concerned is using a metahuman UV map and in their FAQ they write:
"Does this mean I can use Blendify add-ons for commercial projects?
Yes! GlobalSkin and Humanify can both be used for personal and commercial projects.

What license are Blendify add-ons released under?
GlobalSkin and Humanify are released under GPL Attribution. You have total ownership to use the tools across your projects."

If they’re are using the Metahuman UV map how is then legal to use it for commercial projects?

If I have created my own 3d model “FPS-Arms” based one the UE5 Skeleton and the dimension of a Metahuman arms propotions (finger/hand, elbow/shoulder position) and use the “GlobalSkin -Metahuman” skin shader with that UV-Map am I then allowed to sell those FPS arms on ex. FAB?