[roywiggins]

The author even says that he didn't pick the texts to comment on the voice in particular, but that doing the same text (the copypasta, the Bible, etc) with each voice was just convenient.

It's one thing to impersonate someone to make fun of them, but he's not picking texts for them that way. A Bush impersonator reading the phone book isn't obviously parodying Bush unless he starts throwing in comedy Bushisms or exaggerating the voice for effect. Some Elvis impersonators are parodying Elvis but a lot are just doing a straight recapitulation of his look and voice.