It's a cool idea, but his reason for creating it is kinda dumb.
Creating an entire "project" just to check a code snippet is just silly.
Just create a "testing" directory and throw your one off test files into it and compile/run them there.
I start mine with a comment explaining what I'm testing, why I'm testing it, and what special compilation flags are required, if any. I even have an Emacs macro that fills in the boilerplate includes and main function. The overhead involved is probably less than 15 seconds.
It has the advantages that I can test multiple compilers and I keep a history of the things I've tried.