I note from the link that it was used on long-distance intercity services for which it wasn't ideal, and the seats were said to be uncomfortable, though it had a nice ambience. From the interior photo the seats don't look bad, certainly no worse than what you'd get on National Express coaches of the 1980s and 1990s. Perhaps another example of a decision made to ensure failure? On secondary loco-hauled services it might have found favour, particularly with a better ratio of table bays to airline seats.
The idea of having 2 different designs or colours of moquette within a vehicle is something that seemed popular in the 80s and 90s (this coach, mk4s) and for some reason continued post-BR (Virgin WCML sets, GNER Mallard refurbishment). Was this considered to be something which improved the passenger experience at low-cost, or just a recurring whim of designers?
P.S. Just noticed the no smoking stickers on the windows, and on the seat backs... Ashtrays!