And NVAccess is far from alone in having release numbers, based on initial projected release dates, that are not congruent with actual release dates.
Think of any one of the Microsoft Windows 10 releases and I think that 1507 (2015-July) was the only one to actually come out in its projected year and month.
So long as everyone knows what the next release has been designated, and whether or not it has actually been released yet, the world marches on.
Brian - Windows 10 Pro, 64-Bit, Version 1909, Build 18363
Most of the change we think we see in life is due to truths being in and out of favor.
~ Robert Frost, The Black Cottage (1914)