This is simply untrue.
We are falling into the fatal trap of assuming that because we've bought the best facilities it makes us the best academy. It doesn't.
The rhetoric you've stated their is precisely why the rules are in place, because the big clubs will say precisely this 'even if it doesn't work out with us, you'll be better off anyway'. It's a myth. The attrition rates of PL clubs is higher and the number of players who drop out of football completely are higher.
It's better for City to have more pulling power to attract who they consider to be hottest prospects (but this is also a notoriously difficult area to spot a kid at 9 who will actually be good enough at 16+), but it's certainly not necessarily the best option for all those who don't make it. Don't get me wrong, I'm not saying City can't be the best option for some, it's just not going to be for all, and that's the implication in the phrase 'having the best possible opportunity at City'.
If you are 9 years old and two clubs are interested in you (say City and Oldham), it does not mean that joining City is a no-brainer and increases the chances of success. It doesn't.