Its not 20 years old, GeneralsX was updated like a day ago. So the game in question is very modern and cross platform.
> a macOS port of a 20 year old game
GeneralsX is the macOS port. It ported a 20 year old game.
alt Hacker News
> a macOS port of a 20 year old game
GeneralsX is the macOS port. It ported a 20 year old game.