Think about it this way, all swimmings are alike. If you are good at one, you will be good at others. Phelps 8 golds is pretty much the same as one gold in my eyes. What if diving add 1m board, 2 m board, 4m board, 5 m board, 6 m board, 7 m board , 8 m board, 9 m board, 20 m board, and a really brave one, 50 m board (like 1500m in swimming)?
Then like relays in swimming, diving can add 2 synchronized, 4 synchronized, mixed synchronized, etc.
Diving can easily have 80- golds, and one Chinese diver could have 20 golds.
However, this would be as non sense as 8 golds for Phelps.
Phelps is the best swimmer for sure, but that's it.