Epson did, but it was also a re-branded product-- that coating (for Canson Baryta, Hahnemuhle Silk Baryta, Ilford GFS) was all done in the same factory AFAICT.
What paper do you use to replace Hahnemuhle Photo Silk Baryta 310 gsm? H no longer makes this paper. I've tried Canson Baryta Photographique II. Pretty good but not as good.
Where can you purchase Felix Schoeller paper in the US?
Have you tried the Canson Baryta Prestige II 340 GSM? I have obtained excellent results with it. The problem I have with Platine, and I've used a lot of it, smudges too easily. Have totally moved away from this paper due to this issue.