Also according to Internet Archive their robots.txt has changed in the last months.
This was a version that was archived:
At a glance, they are whitelisting some bots, including Googlebot, but not including Bingbot, and disallowing the rest.
You are right about the content type however.
Usually these posts are accompanied by a declining traffic graph for Bing referrers. That would give us more proof and a timeframe to work with.
The post gives two options for their absence in Bing results: a fault at Microsoft or as a punishment. With their history I think a fault on their own part is a more likely option. I can't rule that out.
In 2008, kogan.com was a parked domain. It has nothing to do with the current owner(s).
I thought kogan.com was around in 2008 as the blog goes back to 2008.
The robots.txt is whitelisting bots with agents like "No" and "Due to a deficiency in Java it's not currently possible to set the User-agent." but then blocks all other known crawlers (like MSNbot and Yahoo Slurp).
I was not trying to be deceitful. IMO: Deceitful is a PR stunt arguing it is the fault or an evil plan of Microsoft, when you don't present anything to substantiate your claim, and it is a fact the webmaster is at fault in the vast majority of these cases.