By being one of the first commercial ISPs with a user facing DNSSEC deployment. The issue of DNS redirection being incompatible with DNSSEC is a technical one, here comcast is just an early report of the fact that they will cease all DNS redirection once DNSSEC resolvers are the default solution. Verizon and openDNS both will be in the same boat once client resolvers demand signed zones.
It's no different than hearing about the results of a new RFC from google even if you use bing for search.
