of them beating the old record... and the old record was suspiciously fast - https://en.wikipedia.org/wiki/Wang_Junxia
People are concerned about those times.
One does wonder .. but until something is proved or looks likely, I'm just going to be happily impressed.
Seems to have been an incredibly fast race right down the field - the Australian in the field (Eloise Wellings) was lapped and came 10th, but still ran a 40-second PB.
I think I'd like to try running on that track.
Apparently the first 13 finishers all ran PBs.