I.e. by 6 months, you double once By 6+3 months you double twice By 6+3+1.5 months you double thrice

Since the sequence 6+3+1.5+0.75+... never actually reaches 12 (geometric series), within a year they capabilities would have already been 'doubled' infinitely many times.

Obviously this argument relies on a ton of spherical cow assumptions (and the author does acknowledge this), but i think there overall point is correct that this form of growth (where time horizons compress) is _even faster_ than exponential growth.