Yeah, I would say that volume wise in the straight up sound tests has the EHB at a disadvantage, but that would be more evened out when EQ'd to taste.
They indicate that the EHB weight and balance is the best, but then don't pick it for that category which kind-of leaves me puzzled. It's like they are giving double points to the Spector because of the concave body back. That's fine for overall comfort, but you can't give it the extra points when the category is weight and balance! But believe you me, that 9.3 lbs Spector will make a huge difference between the other two on a 3 hour gig, especially with the neck dive. For me, that is huge and based on real life experience rather than having it strapped on in a studio for as minute or two.
And, of course the Dingwall is at a disadvantage on pricing through no fault of their own due to US import tariffs.
I too have noticed that a lot of these demos seem to be shred or slap-fests, which is not a very useful demo for me to form an opinion as that is not how I would play them. I am a little surprised at the emergence of slap in heavy music and metal as that is not a technique I associate with them. Maybe it's another way to get the speed up with the double thumb technique? I must be getting old...