Disclaimer: I'm an FA-qualified ref. Personally, I think the interpretation/wording of the law applied in the Rodri incident unquestionably needs changing. To the letter of the law, it's onside, and using common sense or (perhaps ignorant?) general expectation, it's offside.
But reading this thread, I love that many people just apportion blame to VAR and referees because it's convenient or the easiest target, when the law and bullet points in question here have been around for years now. It's a one in a million kind of incident that hardly ever occurs. Toys are being thrown out of prams because there is a widespread lack of understanding when it comes to how the laws will be applied... from both players and fans, it seems.
Rodri is initially in an offside position, but not committing an offside offence (whether you believe Mings knows he is there or not). When Mings touches the ball (whatever you do or don't believe about his control or Rodri challenging for/receiving the ball), that constitutes a deliberate action, which 'resets' the fact Rodri was in an offside position initially and therefore cannot, by the letter of the law, be gaining an advantage.