Is that Mega Route X they're on? A bit confused - they start off below the Buchaille but not sure where the walk up through the trees is (a different day and somewhere over in the east?) or then where they are climbing?

Looks like the walk up to Beinn Udlaidh to me. Where's that deep gully at the end? I don't recognise that.

Guessing they stayed in the hut beneath the buchaille, drove to the ben (hence the driving footage) walked up through the trees as per usual from the NF car park and climbed mega route x

that's what it looked like to me!