the offense did not
ever have head and shoulders past the defender, therefore the onus is on the offense to avoid contact, unless the defender moved forward - which could be the case here. you have to determine when/if the defender ever had LGP - LGP exists any time a defender is facing and has both feet on the floor and can be from any distance. the offense appears to have gone through the defender with heavy contact.
in HS it does not matter if the ball went through or entered the basket, you can still have a player control foul regardless.
the defender is in the path of the shooter prior to the shooter leaving the floor.
the knee is not relevant as most dunks/layups of this nature, starting off one foot, has the knee in this position.
i would be curious to know what the crew talked about - no one put a whistle on this play