New order from C&H in what looks like potting soil

[SHag42]

Hello all,

I just received a new order of phals today from Carter & Holmes.
1-Newberry bouquet "blushing Bride" Bare Root
1- corningiana Bountiful x Graprade" in moss
The other 2 Michael Crocker Contrast and Be Tris Newberry
were in this medium that looks like sponge rock and a little dirt. Never seen this in a orchid plant before. Wondering if any one else has. I just found this to be a little odd. Should I go ahead and repot them in bark?

I am excited about my new orchids they all are near blooming size and I can't wait to see them bloom.