There is nothing unusual in a top funded team slaughtering the opposition when riding in this controlled tempo fashion. It is a little suspect that JV targets stage wins with WvA as well as yellow (rather than focussing all resources on one cause).
The most suspect thing I saw today though was Roglic doing a Froome-esque soft pedal in the closing 100ms. I think he was clearly strong enough to take the stage and UK commentators immediately speculated that he had given Pogacar the win, before taking the remark back.
The thing is, such is the history of cycling, if I was clean and winning, I'd consider throwing a stage as well, purely to avoid getting a media grilling and sly remarks about my performance.