That’s what I was wondering, hence the leading question – you can hardly penalise a driver for passing a car which is causing yellow flags by dumping rubbish on the track. Though I presume NR being under investigation for not stopping effectively nullifies any penalty for overtaking him under yellow.
Will be interested to hear Nico “not my fault” Rosberg’s reaction to the ruling, though somewhat disappointed it wasn’t a 15s penalty to at least drop him a place (I’m nasty like that).
edit: have finally managed to watch the replay, and whilst I still can’t spot the yellows, if it was where LH overtook NR, then almostly certainly for Perez as you see him in the barriers just after.