From the front page:
Before today, bands were required to have a physical album before being eligible. Since digital distribution is becoming more and more widespread, we have decided to now accept bands who release their music entirely through digital medium.
However, this does not mean we accept any bands with a few songs on Myspace or Youtube. Only bands with serious digital albums will be accepted. I urge all band contributors to revisit the rules and guidelines page for the details of what kind of digital albums are considered acceptable.
It's good to see that Metal Archives is catching up with the times. That stuff about requiring a physical album hasn't been updated since 2002. They never foresaw the rise of services like Bandcamp. Perhaps this means that bands like Cursed Altar will finally be accepted.