Is article on freebsd jails having backdoor true?

[Andrew Berg]

On 2014.07.01 15:42, Sergei G wrote:
> freebsd-jails-are-a-huge-security-danger
> <http://aboutthebsds.wordpress.com/2013/01/13/freebsd-jails-are-a-huge-security-danger/>
> 
> Does FreeBSD 10 still have this backdoor?
> Do jails put too much overhead, more than virtualization?
Anything on that blog should be considered trolling if not outright libel.