Which words are you having trouble with? "Radio"? "Cyber-neuro"? It's not hard to figure out what "cyber-neuro" means, if it's actually a word.
As for your theory, Kurai, it's cool, pretty sci-fi, and way too technical for Cave Story. Pixel was probably thinking along the lines of "The game starts and you get to see some guy sitting at a computer IRCing someone named Sue. Let's do that again. Maybe the robot's picking up on some kind of radio signal?"
But then again, this isn't about what Pixel was thinking, so your theory is one of the best so far.