:"One source is the company's About page [...] obviously qualifies as an authoritative source for the material that is cited" 
 :It is not a good practice to cite official web sites/etc (see WP:V, WP:RS), but that is really irrelevant to notability. Notability is established, first and foremost, by independent recognition of the subject. The general notability criterion is "A topic is presumed to be notable if it has received significant coverage in reliable sources that are independent of the subject." (notability guideline), the others merely complement it. Note "significant", "reliable sources" and "independent". 

 :"since 2006 without any concern of notability", "How about SixApart?" 
 :Inclusion is not an indicator of notability; Wikipedia is not a bureaucracy, so the level of policy enforcement is inconsistent.