Cheap shot against VFR pilots....
There was a fully qualified CFI next to him that allowed a dangerous condition to foster after a warning from the tower and basic flying 101 rules of maintaining distance from large aircraft due to wake turbulence.
Roger that.
Anyway you look at it the c.f.i. was responsible. Warning was given and the c.f.i. was in the trainer. He will be getting a visit from a f.a.a. rep soon enough and will have to go through review.
Wouldn't be suprised if his licence were suspended. To cover his rear he's most probably filed a dangerous incident report already.