A Deceitful Rook Endgame

The position below arose in the rapid game Carlsen-Vachier, at the Grand Chess Tour Finals in London in December 2019.

I was also in London and I followed the game while in progress from the VIP room together with several Grandmasters, among which was Carlsen's second Peter-Heine Nielsen. The general impression was that this should be an easy draw for Wh…