OK but what you do is you send a DMCA counter-notification saying that there has been no infringement, after which AudioGO has the choice of dropping the matter or taking it to court, where you they will be laughed out of the courtroom.
A notice of infringement has no force in and of itself. It's just a notice. Anyone can send out. Anyone could send one before the DMCA existed as well.
What the DMCA creates is protection from liability for infringement carried out by a user of your internet service if you take down the material in response to a notice. It's this protection, afforded by the US law, against lawsuits in US court, that a US recipient would want... regardless of who sent the notice.
There's plenty to go around. This isn't the only guy sending out automated DMCA notices. They've infamously been sent to networked printers, which were misidentified as part of a torrent swarm by some bot.
There are also more than a few people who fill out Google's DMCA form and list the infringing work as their own work, which is pretty weird too. One time I saw, it might have even been intentional, as the guy appeared to be trying trying to remove his own logo from Google images.
You might be surprised how much you can learn about what's going on on the web if you trawl through the Chilling Effects list of DMCA notices.
Whatever infringing material may have once been located at the end of the link is long gone …and yet AudioGO Ltd are still insisting that the Huffduffer page be removed!