If you take a look at the link below you'll see the eververse weekly of the season. (Bungie can change it anytime)
If you look with caution you'll see that both shaders are not listed in any week at all. I don't know if it's a bug or something, but it's not listed on any [b]know issues[/b] on TWAB, not that I remember though. So keep looking at @bungiehelp twitter to see if they will tell something about it or dmg_04 twitter.