According to their video you enter the box at 1537, but the PCN quotes the offence time as 1538 (offence is causing vehicle to enter the box in such a way it subsequently stops due to stationary vehicles). Contravention as stated therefore did not occur.
Regarding the video itself, it's one of those daft cases where a literal reading of the regulation suggests it's a contravention, but had the vehicle waited slap bang in the middle of the box it wouldn't be which seems perverse. Hopefully CP's input will be helpful (in addition to my opening comment)