My understanding is they refurbished the Manors in the fairly recent past, but not the Chateaus that weren't picked for Prestige reconstruction and remained intact.
I noticed the crew Chateau on the Canadian the last few times I rode it was getting pretty tatty just passing through it
It's usually 'Manor' Sleepers that are found on the Canadian as they offer more Cabins for 2 (Double Bedrooms) and the larger Cabins for 1 (Roomettes). They were refurbished to match the new interior scheme when 'Prestige Class' was launched. The Canadian does occasionally have a Chateau and they are used for crew accommodations.
And it's usually 'Chateau' Sleepers that appear on the Ocean. As the Ocean was using mostly the Renaissance Sleepers and the Chateau Sleepers only used as required......maybe VIA didn't see a need for a complete refurbishing like the Manors. Perhaps with the new Hybrid Ocean consist .....some Chateau cars will now be refurbished. A trip report for the first run of the Ocean three weeks ago noted that the Renaissance Sleepers have been nicely refreshed but not the Chateau being used as crew space......and now there are more Chateau Sleepers appearing.
Tim's Train Travels (timstraintravels.blogspot.com)
The Chateau Sleepers have fewer Cabins for 2 but do have a Cabin for 3. The Cabins for 1 are the old style Duplex Roomettes (rooms are stacked like a Slumber Coach) and smaller than the Cabin for 1 in the Manor cars. Like the Manors....they also have Open Sections (Uppers and Lower Berths) not in use presently due to Covid.