That's the source-code that you compile from, yes.
I'm not sure if I should do this, but I've attached my autoexec.bin and the .fir file for the 650D from the ftp space of the site.
I take no responsibility for what happens if you brick your camera, and I have no idea how to help in such event. I'm not even 100% sure this works.
You'll need to place both into the root of your card and then download the magic-lantern nightly and place the ML folder in the root. Then you'll need to download EOScard and check all threes boxes and click 'save'. Pop the card into your camera and then run the firmware updater and that should work, I have no idea as it's a different process to what I originally did.
Link removed by Nanomad: The bootfix does not enable the bootflag, it fixes it...and the FIR bypasses a crucial safety check
As always, the safest and officially recommended method is to wait until the official Alpha release.