No, it does not, and can't, because the population curve is irrelevant; the error isn't about the projection of exhaustion (which may also be wrong, but it is the current intermediate-scenario projection), it's about the basics of how SS works at what trust fund exhaustion means.

If the trust fund is exhausted (which the population curve does say something about), beneficiaries don't get nothing, they get benefits limited by current SS revenue.

There is no projection i am aware of under which people working today would not get a majority of their benefits.