Van der burgh wouldn't have gotten that world record if he hadn't performed 2 illegal fly kicks before the pullout. Hard to believe they didn't notice this.
These suits were banned because they were thought to be too much of an advantage- it has nothing to do with modesty, it has everything to do with hydrodynamics, or how the body moves through the water.
“You will not go close to VDB in first 25m” - no because he’s a self-confessed cheat, as perfectly shown on the u/water camera, with his illegal fly kicks.