I'm pretty sure the golf course is the existing one which is already there, and was simply sold to Four Seasons as part of the deal.
And really, the Four Seasons itself doesn't bother me nearly as much as other parts of the deal. It's the Golden Oaks neighborhood that came a long with it. The idea of selling off Disney property to become a neighborhood of matching McMansions doesn't sit well with me at all. It reads as over-commercial and completely against the lofty ideals Walt held for his property, and seems like the very kind of thing he came to Florida to escape in the first place.
And I definitely don't agree that Eisner was any better. If the 1980s/early 90s Eisner wouldn't have lept at this opportunity, the late 90s/2000s Eisner definitely would have.