Read what I said; the word 'deliberate' makes it a bookable offence. There may well be a grey area where a player spreads their hands out and blocks the ball but that is different to where there is deliberate movement of the arm to the ball.
Just watching the league cup highlights and Leroy Rosenior was praising Oliver for keeping players on the pitch, ie Lucas and Henderson. Costa aside, bearing in mind the ref didn't really see the incidents, is a ref right to keep players on the pitch when they have deserved a second yellow...