The significance of ping pong is not beating humans but that it is a sport that depends on high precision, fast movement, and rapid responses. The aim of the game is to out maneuver the opponent and corner them such that they can't respond and adapt quickly enough. A robot beating a human means that it does this better, faster, and more precise. A few days ago, a bi pedal robot ran a a half marathon about eight or nine minutes faster than the fastest human can.

These are not the clumsy robots of a few years ago that could only do simple, pre-programmed tasks and had to work in fenced off areas because they had no awareness of anything around them (including fragile people) but self stabilizing, inhumanly fast running robots that can operate in any kind of environment and adapt to a wide variety of tasks. And then complete those tasks at very high precision and speed.