Discontinued on Greenbook release date 12/11/1991.
Starting with the 11/8/1995 release, the first value that is considered a "projection" changes. Prior to this, once the GDP advance estimate was released, that quarter's values were no longer projections. With this release, the values are considered projections until after the final estimate of GDP is released.
The actual FRED Series ID and title are:
Gross National Product: Implicit Price Deflator