Nah, he means it. Or even if he doesn't, that's some motivational game he's playing. It's what separates him and his sides from the rest. They'll go out to smash Sunderland tomorrow.
Of course there's always a chance they wont. If I was a betting man though, which I am, there's no way I'd put money on Sunderland. You shouldn't bet via "sods law" because it's rarely correct. Sunderland are absolute gash, Man United are in the winning zone, they'll want to smash records, they'll want to make a mockery of the City in particular by finishing as high above them as they possibly can and yes, I'm sure they'd **** love to win the title at the Etihad.
Advertising or not that man knows the game and how to play it.
I don't deny he's a very good manager and he knows how to use his press conferences and the media well... but this ('They celebrated Citeh winning, we'll remember that') is just rhetoric imo, building the game up more than anything. I don't think for a second Fergie is sending his team tomorrow with anything special on their minds - if they spank them, which they could well do, it'll be down to them just being a markedly better side than Sunderland have ever been, let alone the Sunderland side of today, not because he's got them fired up something special for this match.