The title is contradicted by the README:

> Built on EA's GPL v3 source release via fbraz3/GeneralsX (which did the heavy lifting of the macOS/Linux port — this fork adds the iOS/iPadOS port and a set of engine fixes)

It’s cool that someone took the extra steps to run it on iPad and iOS, but if the README is correct then it was already ported to macOS? Going from Mac to iPad isn’t trivial, but it’s a much smaller jump than porting into the Apple world the first time.