Pretty sure this is the same in the Europa League, some of Rangers games has 28 cameras at them, where as some others only has 20. Other Europa League games may have only had 16, so surely it's about giving the referee/officials the most amount of information possible.
I really don't see the issue with that, as long as there's a basic minimum standard for VAR - which there is.
Should also point out that the BBC ALBA games are supposed to have seven cameras at them next season, interesting that hasn't been mentioned in this - and all of those games will not include the OF.