Because that is correct. Those vapor shoes will eventually get banned. The swimming suits were banned so quickly because Michael Phelps was openly agianst them back then.
Btw, does anyone else find the meter gaps on screen annoying? I know it can be measured but there's absolutely no point in having this on screen all the time. Just another useless gimmick. It's totally irrelevant there's a 50m gap after four minutes of 10,000 race