tatham
I'm not familiar with this particular project, however I'd like to clarify a bit based on our engagement focus. Organisations like SEEK engage us to help improve development team process, with tooling on the side to support it.
While the case study talks about them engaging us to help with source control, it doesn't talk about an inability to get something like Git, Hg or SVN working. Instead, it talks to them getting some external advise about effecting an organisational change in their development teams. We also likely brought experience/scripts to help migrate their history from whichever ageing system they were in.
TL;DR: The SEEK devs wouldn't need us to come and help them just install an SCM and leave.
Varnish is certainly stuffing us up a bit. There's a note about this at the bottom of the page.
If I did this again, I wouldn't deploy it to Heroku for this reason.
Mostly, we wanted to play with some tech and we came across the domain name httpstat.us which we just thought was cool.
http://isitbeerti.me was another experiment of ours on the .NET platform