Honestly, my initial thought was: is that a real video or mostly an AI generated/edited stuff?
I haven't watched all the video but went through the intro, sampled most of the examples and got the process/idea & main closing speech; what I roughly think of this kind of video, in no particular order:
- yes, they "all sound" the same" on my usual computer speakers
- you can make anything sound the way you want through recording; actually playing & feeling the thing in the room usually is a vastly different experience
- if you try/want to make 2 things sound the same, especially in a recording, you'll probably be able to come (very) close
- that doesn't mean the different gear being tested have to sound the same, or can't do different / other things; including the way they "feel" and react to you as a player; which is key to me
- what a particular piece of gear can do that is kind of special/unique, is what is interesting & relevant to me; not what it "could do same as..."
- then talking about influence of particular gear / component in the spirit of that video for a minute: as I've already posted several times, my experience makes me think the speakers/cabs probably are the single components that can have the biggest influence on overall sound & feel in a particular electric guitar rig
- having all that in mind I'll refrain from commenting again on how "accurate" or "relevant" most youtube "demo/test" videos are to me...
In short, agree with most Rob already posted above.
And not really sure of what is the concept / main objective behind such video, and what added value it brings?