I'd like to see it on some brighter background where things would be more visible.
That Adidas thing was just about the Master AFAIK. For example Sigma Sports has those frames for preorder: https://www.sigmasports.com/item/Colnag ... meset/KZZ4
So it's still a thing it seems, but strangely they really seem to throw something onto the people an let it live its own way...
As for the necessity to make some extra money these ways I don't know. The C-series sell well, they're still not up to the demand and as they're one of the smaller companies I think they're doing quite well overall, even taking the other frames into the account. But if they've got an excess stock of some older frames (or parts they're made from) which don't sell much anymore, it may be the way to get rid of some of those.
By the way, I've also found these Brushed Metal C64s at the Sigma Sports website: https://www.sigmasports.com/item/Colnag ... metry/MHHU
It seems to be another variant of the Art Decor scheme. Colour code BUSL