Class AB is often cheaper particularly for lower power level, and at very low power levels control and bias circuits reduce class D's efficiency advantage over other classes. Manufacturers will generally choose the lowest price that meets the design goals.
A look through the review index and searching for amplifiers, e.g.
https://www.audiosciencereview.com/forum/index.php?pages/Reviews/ , will show a number of class D amplifiers with THD+N in the -75 to -80 dB range at 20 mW (lowest plotted in the one I checked, a Buckeye Hypex NC502MP design). If it rises to say -70 dB at 10 mW (very conservative extrapolation of the curves) that is 0.00001% [100*10^(-70/10)]. As others have said, just look through some of the reviews on ASR.
The "truncated bandwidth" argument has already been addressed in previous posts, not sure it is worth continually repeating that FUD.
I would be leery of using marketing literature as an unbiased technical reference.