The article you link to doesn't support your claims. It explicitly states that Gnome 3.14 (which, btw, is only one revision ago, since Gnome uses the old Linux kernel version scheme) would still support ConsoleKit (i.e. a non-systemd codepath). In fact, Gnome 3.16 still supports ConsoleKit, at least in gdm (see the configure-option here [1]). Can you point out commits where non-systemd support was removed in Gnome 3.14?
And what exactly do you mean by "redirected the systemd calls"? Gnome calls certain methods on certain D-Bus objects; if there is a process on OpenBSD that receives these method calls and acts appropriately, why not call that implementing that particular interface?
I don't want to diminish the amount of work that went into this port. I find it really great that someone is doing all that work. But I don't think that the picture you paint of this is entirely accurate. You assume that the OpenBSD-guys hate systemd. That might be the case (it probably is for a lot of them), but I don't think that this has anything to do with this video. If the video e.g. had shown that they removed any reference to systemd whatsoever from the Gnome code and inserted some sneering comments, I might agree with your conclusion. But it simply shows that they succeded in porting Gnome 3.16 to OpenBSD.
How would this video have had to look, to persuade you of the opposite (i.e. that there were OpenBSD developers that love systemd)?
1. https://git.gnome.org/browse/gdm/tree/configure.ac?id=3.16.0...