Yeah, you have to remember that Opal Tapes is a boutique label that blew up really fast and unexpectedly due to brilliant first releases and artists on the label like Huerco S moving on to much better things really quickly.
Right place at the right time for that brand of techno.
They probably get dozens of demos everyday, but they really only want to release their friends’ music, etc.
Plus, one of their releases was pulled due to plagiarism via samples of other artists, so they may be wary of taking releases from unproven acts now.