Seriously - has anyone ever heard this term in real life?

Only place I've ever seen it is this (pretty funny btw)
http://techno.org/electronic-music-guide/

Green velvet is gloomcore? Why did nobody tell me? They should make public service announcments when they make up these stupid ****ing names. I'd only just got to grips with the subleties of terrorcore and horrorcore, now I have to master gloomcore.... bah