Sure.
The problem is challenging. They are attempting to measure linearity down to -140 dB. As you and I both know, there is no DAC in the world that produces meaningful signal at anything close to those levels. But importantly, there is no ADC in any analyzer that can do the same. Yet they tried anyway based ironically on advice I gave to AP

. That if you use aggressive filtering of noise and distortion, you can indeed eliminate a lot of variability.
So they did that and took that the N'th degree. At -130 dB, the Schiit Yggdrasil DAC produces this according to Jude's measurement:
View attachment 13295
A jumbled up mess which proves what I said at the outset: that the output here is completely corrupt and does not at all represent any fidelity to the digital input the DAC was told to produce.
Jude runs this through an aggressive high-Q filter and gets this:
View attachment 13297
We see that the filter has completely removed all traces of distortion and noise. So of course if you then measure this, it shows that the DAC is doing well.
But that is NOT what we hear out of the DAC. Nor what it electrically produced. We are cleaning up the output of the DAC and then measure it, then declare it a winner.
The "trick" here is to use only the filtering necessarily for the ADC to not have its noise and distortion profile be below that of the DAC under test. This can only be done through a bunch of trial and error which I went through on APx555 analyzer. My older 2522 "happened" to do this well out of box. I tried many things including changing the excitation signal, settling parameters for measurements, custom filtering, etc. I finally found something that while may not be identical to 2522, is very comparable.
Summary
Any filtering in the analyzer cleans both the DAC and ADC output. It is tempting to select an exceptionally narrow filter to get rid of all noise and distortion as to even show accurate values to -140 dB. But we know such data is fictitious as we don't know how to build such DACs. By carefully selecting the filtering and analyzer setting however, we can get reasonable results to about -120 dB. Any attempt to go beyond that in my testing will lead one into a ditch.
P.S. The FFT method is even a more extreme case of such filtering as there, you get to look at one individual spike and ignore all other noise and distortion characteristics.