Move sideways is not the same as rotating. The images show the scrum moving sideways and the rotating. I think he has a point.
The writer of the article says this is an example of Black illegally screwing the scrum. I'm not so sure. IMO, its impossible to tell for sure which team is responsible for this scrum going sideways/rotating but there are a couple of clues
1. Black LHP is turned inwards, boring in, which is illegal. However, Gold THP is also illegally turned in and appears to be lifting Black 1 upwards. IMO, what one player is doing is a response to what his opponent is doing. Unfortunately, the clip doesn't show the scrum from the beginning, so we cannot see which player was doing what first.
2. Black 5 definitely appears to be pushing sideways towards his right
3. Gold 2's left arm is lifting his THP's jersey up and to his left, so he is pushing his THP to his left.
The more I look at this clip, the more I think the Gold scrum is pushing the Black scrum to the left (top of picture) and the Black scrum's response is screw the scrum to avoid being pushed sideways. Both trams are equally responsible for what is happening here.
I would reset after a word with the front rows about pushing straight.