Epson informed me that they were correcting the MSDS and removing the claim that the black ink is a carbon black. The copy of the new MSDS ink composition section is on page 1 of my PDF on the matter. See http://www.paulroark.com/BW-Info/UltraChrome-D6-Noritsu-blacks-compared.pdf
Hopefully they will also correct the copies on the web.
Epson dyes are very good, but being able to make a carbon black that penetrates a micorporous paper and prints with no artifacts is still, as far as I can tell, beyond anyone's capabilities.
(Graphene-based ink where the carbon lays flat on glossy papers may not be.)
Paul