Why are they blacklisted?

The moderators think the band isn't metal because it doesn't use guitars. Even there are probably at least a dozen songs that you wouldn't tell much of a difference anyways - they seem especially strict on the stance of Botanist. Not particularly sure why, the band is blatantly a lot more metal than a lot of inclusions on the archives. You'd have to be deaf to think the music isn't metal in any way whatsoever.

Also, there's a thread for this.

Correction, the absence of guitars isn't the problem. It's the absence of metal riffs. But thanks for assuming and sharing it as a fact.

Please just direct them to the correct thread next time, t1337Dude.