It's a pity that he didn't test conversion to/from higher bit PCM.
Here's what 32bit float 384KHz test signal conversion looks like with Weiss Saracon:
RightMark Audio Analyzer test: comparison
Also, as you can see, from Dynamic Range point-of-view, within the 20KHz audible range, 384KHz/32bit float fits nicely into even the "slow" DSD 2.8MHz format.