Glad you like it!
If you clone the git repo (link in first post), you will find a file called cmdfonts.h, which contains all the data necessary for the 10 raster fonts. It is embedded in cmdgfx_gdi.exe and cmdgfx_RGB.exe. On page 3 of this thread I have posted some C code showing how to use (one of) the font data arrays in cmdfonts.h.
The data itself (if I remember correctly) was retrieved using a combo of a batch script (to write characters in ASCII order at the top of the cmd line), a screengrab tool (to save the text as bitmap), ImageMagick to print out the pixels in the bitmap as text data, and a little C code to organize the data into 1-bit-per-pixel data arrays (finally producing cmdfonts.h)