This article comes out one day after the removal of squeeze and assumes the decision is final. It would not be the first time that a package reenters testing once the situation is clarified and when the security team confirms that it is able to provide some security support for it.
And the chromium maintainer also accepted to backport security fixes once v6 is no longer the current stable version for upstream. I hope it will get back into squeeze before the release.
This is an internal communication failure from Debian and it becomes an external communication failure because the maintainer was frustrated (because Julien Cristau removed the package and gave no explanation to the maintainer) and blogged and you picked up the news very quickly (maybe too quickly).