Ok. I had a little time so I skimmed over what he has written this time. First of all I will attach to the chroot thing. He has the history wrong. Here is a better reference for it
http://en.wikipedia.org/wiki/Chroot. Now, he is correct that chroot has long history of vulnerabilities and it is not only tedious to create, but also there are several security considerations
http://www.unixwiz.net/techtips/chroot-practices.html. However, he seems to have the usual Linux misconception that a jail and a chroot is the same thing. They are not the same thing. Jails are practically virtual machines that have read only access to kernel services in their own sandboxes. Without any extra overhead that comes from other virtualization techniques. The limitation is of course, that you can't run just any OS in the jails. But they are useful for separating public services from the whole system with the added benefit that setting them up is a lot easier than chrooting. Most of the time you can't even properly chroot programs in any *nix OS because of all the dependencies. Let alone allowing some users to a chroot and thinking they wouldn't break out.
In terms of security, I would place FreeBSD in the middle of Linux and OpenBSD. The Linux people don't always put too much effort to secure their stuff or even supplying the users the program versions with the latest exploit fixes. Maybe not exactly relevant but I'll reference this anyway in here:
http://article.gmane.org/gmane.linux.kernel/706950. The OpenBSD is most likely the most secure operating system just as it claims. It's also not necessarily as hard to use as the reputation claims. However, they don't make any compromises for the sake of convenience. FreeBSD does have a good security track, but they also do make compromises and apparently they are a little bit on the dark side when it comes to security announcements from the OpenBSD people.
So take your pick, for maximum security take OpenBSD, for maximum (*nix) convenience with less focus on security, take Linux. If neither one especially appeals to you, pick FreeBSD.
Bottom line is that most of the time the technical stuff (everything else is just weird) this guy writes is the opposite to the truth. FreeBSD is certainly not the greatest thing out there, but not a bad one either.