You cannot introduce a human structure to manage water more efficiently than nature
If you actually believe this then there’s nothing anyone can say to help you.
If a naturally occuring spring runs directly into a wide flat area in the middle of the Mojave desert, then it doesn’t naturally reabsorb into the ground as the hard pack just makes it sit on the surface. Since the water is shallow and sitting on the surface, it evaporates instead of being used to water native plants or support native animals.
The golf course in question is not a dam, it’s putting the already available water to use more efficiently. Growing non-native grass, but also native plant species, and providing native insects and animals a way to utilize that water before it would have otherwise evaporated.
Dams destroy native ecosystems by flooding and displacing them, or removing available water downstream. The golf course in question does none of those things.
“Nature is perfect and humans are capable of nothing but destroying it” is a great take BTW. You could have saved a few people some time by leading with that.