Nobody can clear it, it only seems that 1 cm is not much. But that 1 cm is like 0.1 s in 100 m at this level. And now nobody is clearing even 240 cm, so it may take another 5-10 years until someone even comes close again. It is very difficult sport, it takes a lot of patience, most gen Z is million miles away from the level of patience required to reach such levels at this sport.