The proof in the pudding will be when they release the actual seat width and pitch for the trans-Atlantic flights. Then, and only then, will I be able to judge the so-called "comfort" they are advertising. From the comments in the article, they seem to be focused more on the air circulation and equivalent-altitude cabin pressure, than actual seat comfort for their passengers. The former is a "nice" benefit, while the latter is critical for real comfort, IMO.
According to SeatGuru their current configuration in their A350 aircraft is 3-4-3 in economy with 32" pitch (only OK, not great) and a seat width of only 16" to 17" (very tight, especially with that configuration). Premium seating is 2-3-2 with 36" pitch and 18" seat width, which is much better, but how much more will it cost? For me the jury is still out. Based on the prices charged, I assume the New York to Paris flights will be similar, if not identical configurations. The economics of the low prices don't allow much wiggle room.