It's not impossible....... I verified it myself (even my older brother verified the whole thing legit)! lol lol
NOTE - It is actually possible, with a technique called "air jump." Sure, it is not terrifying difficulty, but nil (if you do not take the factor called shortness)
You can jump mid air (just once until you have touched another normal [can jump] platform) if you have not jumped after last standing on a light purple brick.
Xray - Yes, air jump can be unexpected for some people...
GearedWorm - thanks it is a "problem" that many have tried to fix but most of them sticks with the bug because it looks cool (celing jumping could be another one)