Is this bloke's accent a piss take or how he really talks?
I've never met or known anyone in Manchester to talk with the false emphasis on certain words that he uses to make it 'more manc'.
It sounds like someone trying to take the piss out of mancunians.
If he is really from Manchester and it's an exaggeration of his real accent, then he must be one of the least self aware people around. Anyone with half a brain would realise that someone asking him to portray mancunians like that is trying to take the piss out of them (even if it's unintentional because it is the brainchild of some advertising clown who thinks it is ironic)