it was also revealed that NSA had secretly paid RSA Security $10 million to use Dual_EC_DRBG
This instance is unsettling -- especially to RSA customers -- but it is very much a different beast from a court or legal order requiring installation of a backdoor.
As your link points out, all the government could do was try to encourage manufacturers to go along, but even in the crypto wars of the 90's they couldn't make anyone get on board.
EDIT Did anyone use the Clipper chip in any shipping product, ever? Note that a positive answer to this still wouldn't answer the question of a company being forced to do it by government order.