I would ignore all of the subjective sound impressions. Without any decent controls, they are all just fantasy. The fact that they use a network filter should already raise all kinds of red flags. And why not just name the cheapest streamer in the “test”? Likely it’s the WiiM ultra. The price matches, as well as the cable difficulties:
This is simply ridiculous, given that the device is fully transparent. All the subjective stuff is nonsense!
Being a conductor doesn’t make one magically immune to biases. If you do these comparisons, at the very bare minimum you’ll need to level match the devices to within .1 dB of volume. Otherwise volume differences will trump anything else.