Yeah, every training artifact is worth 20 except Jhebbal Sag’s. Funcom nerfed Jhebbal Sag’s to 1 because you can collect a bunch of them from the Midnight Grove.
The problem is, the Flesh of Remembrance from the Midnight Grove is a different item to the Flesh of Remembrance acquired from named Jhebbal Sag priests, so there is no reason for them to have nerfed boths types. I mentioned this in the Update 2.7 Discussion Megathread, but Funcom didn’t acknowledge it, so I don’t know if they care.