The measurements you are linking to are showing the level of distortion (HD3 v level) not dynamic range! The Y-axis on the graphs is showing the 3rd harmonic in dB in relation to the mV given in on the x-axis. This has absolutely nothing to do with dynamic range and it is also not the signal-to-noise-ratio. The fundamental frequency in those measurements was at 315 Hz. HD3 refers to Harmonic Distortion at 3rd level.

It's just annoying to post unverifiable numbers without a credible source and expect others to do the hard work of verifying it (or just take you at face value, probably). It has nothing to do with AI except insofar as your own feelings on AI convinced you this is a reasonable method of communication.