They are saying today the VAR thought he was confirming that the goal was onside, he got the on-pitch decision wrong. So definitely people/process rather than technology, although the technology part has made its share of mistakes.
I also can’t agree on the Jones decision being harsh - any time you go over the ball and catch somebody with studs in todays game it’s an automatic red. By the standards of 15-20 years ago maybe not, but it’s cut and dry at this point.