Like is said...it depends on the coating they used. If it's abradable like they use on the Pistons it is self clearancing and the particles do no damage to the engine.
This coating has been out long enough to be better known.
I know what you mean about being out there long enough that a lot more people should know about it, the stuff I have came from a company that coated things with it in the 80's and it was very expensive, one year they did every bearing in Bobby Rahal's car, not sure if it made a difference but nobody in racing really knew about it or used it. It was developed in the 60's for outer space and goes into the pores of the metal and doesn't come out, and it is very slippery. I've done pistons with it and carbon doesn't even stick to it it just wipes off with a rag. Clearancing on the pistons would be nice but when does it stop wearing? and if it is a plastic that is baked on it's hard to believe the waste from it wont plug the filter or get in other places.