Not sure why its so hard to figure this out.

I may just be overlooking something stupid but I cant quite seem to figure out the deal with the demonic hideout decorations.
1: unlike all other decorations, including purchased one they are listed as consumable.
2: They are not in the mtx store, and I am certain I did not by over 100 of some old mystery box thats not in the store (I know some of the early ones did not show up there later).
3: I have limited number of them, which seem to be the case for mtx decorations

tried looking them up on google, or finding them in other peoples hideouts but of the couple dozen hideouts I did look into that looked like they might have them I could not find out if mtx or not.

When filtering they are in the demonic section
Demonic accretion
Demonic barricade
Demonic horns
Demonic Palisade
Demonic remnant
Demonic sore

Thanks for any clarity you can bring me to this.

https://www.youtube.com/watch?v=SZOl_2VzzPQ those all came with the ghost-lit hideout as "mtx" and are limited ...if thats your question ?