They weren't going to win the Tour today, under any scenario, nor are they likely to win the Tour on any future stage...but to let Mateo burn matches by pulling with the guy who DEFINITELY is your hurdle to the yellow, who will attack your leader (who was clearly struggling to stay on Pog's wheel) on the last gravel section (and maybe bury Mateo, becuse he burned his matches, and they're racing against the, by far, strongest rider in the race), isn't worth the risk.
VLAB is not going to win this race by being daring on a gravel stage. If they have ANY chance, it's in the last week, in the mountains, and Remco isn't your hurdle to get to yellow. Why kill yourself to get 24 seconds on Remco?