That blog is about redirect issues that involve the interface between the desktop www version and a mobile version of a site. It's clear Google is very sensitive to the mobile landscape and are prepared to penalise sites (the desktop WWW site according to the example) that don't redirect as per Googles preferred method.
I may be jumping at shadows but is this perhaps an oblique way for Google to say that if a site wants to be taken seriously and rank well against its peers, there needs to be a mobile version to reach the increasing number of smartphone users.
Is there anyone here who feels that not having a mobile site might be in some way be related to their post Penguin demise? I guess that question can be also be asked in reverse... has anyone seen an improvement in their desktop site after launching a mobile site?