That if won't happen anytime soon neither for the Earth in general nor USA in particular. Media often loves to move goals from population growth to agin g population to fertility rate, etc. All those while connected do not negate the fact that population is growing, and growing fast. That 'once population growth reaches zero or negative' is very theoretical and UN is constantly underestimating population growth. So no, we will not see that in our lifetimes.
I think you are missing 'in our lifetime', even though you are quoting 'will double in ~150 years'. Also 'declining every year' doesn't mean it won't start growing again.