Here is the problem with this kind of "let me save you from yourself video." Our top problem in audio is subjectivity and random assessment of audio. Any video that wants to save people needs to focus on that. The unreliability and randomness of ad-hoc listening tests. To take on SINAD instead means losing sight of real issues in audio evaluation.
Even if someone goes an upgrades a $300 DAC to a $500 DAC for better SINAD, not much is lost. Contrast that with spending $1000 on cables, $2000 on power conditioners, $1000 for footers, $10,000 for a DAC, etc. That is where massive damage is done to people's pocketbooks, and understanding of audio performance and fidelity. In Cameron's video he defends such as tubes sounding good, propagating such myths.
There are real problems in audio and there are nits. SINAD overreliance is the latter. No different than someone washing their hands multiple times a day.