I would argue that not allowing people to flip does not necessarily keep the value of a building up. Sure, it may initially prevent flooding the market with units, but it also hinders after-market liquidity. And if the market has declined by 2009 when the Vue is done, and/or borrowing rates have risen to 8%, many flippers will simply walk away from their 10% deposit rather than be stuck with a unit that has fallen in value by 10% or more since they went to contract. This will happen regardless of whether there is a 1-year restriction in place or not, so it could still leave plenty of units for the developer to re-sell into the market while you are forced to hold onto yours.
I would suggest that those buyers might want to check the very fine print of their sales contracts, because if I have learned anything over the years it's that what a real estate agent orally tells you and what's written in the contract - well, those are often two totally different things.