This is a joke: the robots.txt is a file on websites used to give instructions about their site to web crawlers.

Disallow: tells the robot that it should not visit those particular pages on a site. Or in this case, terminate those individuals.

This is probably a joke with a reference to Terminator, where T1000 and T800 are "killer" robots. So if those robots obey web standards, they should not kill Larry Page or Sergey Brin when they destroy Google.

Not everybody here is technical, and not every technical person necessarily has web development experience.

I've personally worked with some brilliant embedded software developers and compiler writers who likely wouldn't know what a robots.txt file is, because they've focused their skills and talents elsewhere. Despite not knowing what a robots.txt file is, they're still far more technically capable than even the best web developers I've ever encountered.