From the lawbook
(and note once the ball has moved from the line of touch the lineout is over)
Flying wedge: An illegal type of attack, which
usually happens near the goal line, either from a penalty or free-kick or in open play. Team-mates are latched on each side of the ball-carrier in a wedge formation before engaging the opposition. Often one or more of these team-mates is in front of the ball-carrier.
Law 9: Foul play
Teams must not use the ‘flying wedge’.
Law application guidelines
Law changes summary
The five current Global Law Trials – Goal Line Drop-out, 50:22, jackler protection, banning pre-bound pods in open play (flying wedge) and approving a single latcher – will become full law.
Law application guidelines
Side entry
On the whole, the coaching, playing and refereeing application has seen a cleaner, safer breakdown, especially aligned with the 2021 global law trials around protecting the lower limbs of the jackler, permitting the 1-man latch but outlawing the flying wedge of 2+ players pre-latched which have now been moved into full law.
I maintain that if the defending lineout players step aside, not offside which they do in the clip, you can't bind onto the ball carrier and march down the pitch.
for the clip we have I would say,
penalty advantage Purple offside;
Use it blue; Either pass it away or lead ball carrier breaks with one maximum binding onto him
If they don't , come back for the penalty on 15M line;
Stop the game and explain my decision IAW laws of game.
IMO USGMG are simply wrong