And I repeat, the manufacturer/distributor set the amps at 1 ohm, not the reviewer, and it was certainly not incumbent on him to open up the amps and reset the amps at a different setting. That's easy enough when you have separate taps outside the amp like ARC and VAC do, but not obvious or easy with Jadis. According to JA on his measurements section, the distributor told him the amps were set to the 4-8 ohm setting; if there was a mistake, don't blame the reviewer. If anything, I'd like to have the distributor resubmit with the amps set at 4-8 ohms and see how that works.
As far as running the dCS right into the amps, my experience with all amps I've used, not just my old JA80s, has been to prefer the sound with a preamp in the chain (especially a Jadis or similar quality tubed preamp), although they certainly weren't lacking for highs or lows when I tried a passive volume control with them. However, there are a lot of people in these forums who prefer running their DACs right into their amps, as any search in the forums will show. I would like to have someone like Al look at the specs and see if there really was a mismatch between the Jadis and the DAC that would explain the reviewer's observations, but unless you can show us one you're just speculating..
The review does highlight the great strength of Jadis electronics, a wonderful midrange. Even with rolled off highs and a full but overly ripe bass, my JA 80s were in my system for well over 10 years with a less than optimal speaker match (Duntech Princesses) simply because the midrange was that good. Jadis really isn't for the person who wants aural thrills, and I would also submit that their products are more geared to the person who listens to acoustic rather than rock/electronic music. Michael Fremer (I think correctly) pointed that out when he reviewed the JP80MC preamp years ago.
Ultimately, you made an excellent choice getting the JA30s (which, by the way, in my view have the best bass reproduction of the Jadis amps, at least in their original version), I'd not worry about the review. A person who knows the reputation of Jadis and what they are best at won't be scared off by the review (unless maybe if they own Wilson Alexias).