I think they talk about the second pit-stop when McLaren decided to not double-stack and pit Piastri first then Norris next lap.
Edit: And the choice to use Soft tires when Mediums were available which would probably have ended faster than both Hamilton's Softs and Verstappen Hards near by the end of the race.
This is the one I can't figure out either. Not sure if that one is on the driver or team, because Lando fumbled his way into "any kind of slick would be better" over the radio. I haven't had a chance to watch it back to hear the entire exchange yet though so maybe there was a more defined call made at some point that wasn't broadcast on the main feed.
The softs were used and the mediums were new. McLaren has long carried the trait of quick tire switch-on and should have known it was more or less a sprint to the finish at that point.