I believe he means using your gmail address allows you to use youremail+itunesrecoveryemail@gmail.com and it will appear to be a different email to iTunes. You

I believe he means using your gmail address allows you to use youremail+itunesrecoveryemail@gmail.com and it will appear to be a different email to iTunes. You could also use hotmail/lives 'disposable' emails to achieve the same ends.