I still think the 4+ set could be from TFA, it'd make more sense I reckon
All the sets are Endgame (of course, the biggest MCU movie and one of the latest) and then Iron Man (2008), so why make an AoU set.. it doesn't make any sense to me, if they're making an Infinity Saga subtheme, then they'd start it from the beginning so Iron Man and after that, something maybe TFA, Thor or The Avengers but not the second Avengers movie..
But of course, that would be the case if Lego were doing things logically.. which isn't always the case
Also the "black avengers motorcycle" is not from an official description, it's from the description written by a leaker? or even if it was by Lego.. they can still put label on things without being accurate, happened before but I guess we'll see