Finally got to see it -
So, what it looks like to me is that they are moving into the “Sins of Youth” 5th week event storyline.
In the comics Young Justice was getting flak following a series of public mishaps. A program to shut down them (and all powered teams) was launched.
Klarion (Bum bum bum…) the Witch Boy used his magic to turn all of the adult heroes into children and toddlers - In an attempt to counter this a mechanical device was used trying to turn the heroes back - But the two forces combined and exploded.
This turned the teenagers into adults, the adults into young teens, and the aged heroes (Like Jay Garrick) into young children.
So Young Justice - being the adults mentally and physically - had to correct the issue while taking care of their now younger counterparts.
The whole deal was the old - See how the other side lives - Though it did give us the benefit of Superboy getting access to his full Kryptonian powers.
Wonder if that’s what they’re angling for here.