The back story is 23andMe declined a federal request for a customers DNA. This was the government backlash as a result of protecting user privacy.
This action is a core function of what the FDA does.
They have been in talks since 2009 to help 23andme understand what they need to file, and how to do it. 23andme has (repeatedly, it sounds like) failed to do that.
This notice is a standard corrective action taken by the FDA after failure to complete 510(k) submissions.