At best we're listening to a (bad!) recording of in-room speaker output with no clear info on controls used between runs. At worst we're seeing actual fraud in action. This video is worse than useless, just like every other "I recorded a video of my speakers playing music" video.
Unless you've EQ'd your headphones flat and they did a really good binaural recording with proper controls, I really struggle to understand what real difference you could possibly hear in a format like this. The distortion of your headphones plus their speakers, plus whatever trash-tier mic they used will overwhelm any differences in DACs thousands of times over. It's like trying to watch TV in someone else's house through a TikTok video... and then try to tell yourself you can see the pixelation in their TV that way. Just ... why??
Unless you've EQ'd your headphones flat and they did a really good binaural recording with proper controls, I really struggle to understand what real difference you could possibly hear in a format like this. The distortion of your headphones plus their speakers, plus whatever trash-tier mic they used will overwhelm any differences in DACs thousands of times over. It's like trying to watch TV in someone else's house through a TikTok video... and then try to tell yourself you can see the pixelation in their TV that way. Just ... why??