These 'essays' are ten a penny nowadays and posses a million of faults, mis-quotings, errors and complete lack of facts and research. This article just talks to much about fucking videogames. Where's the demoscene?
(by the way, wrong usage of term. Chiptunes were MODs created with small samples as to emulate the sound of chip synthesizers. Music created with the chip synthesizers should be referred to as 'chipmusic'.)
If you really want to read up some good theory about chipmusic, visit Goto80's blog chipflip:
I wish people would properly research once and for all, like what Goto80 is doing. They should shut up otherwise.