This sounds interesting but I'm not sure I fully understand the system. Say for example my email address was Shahed@gmail.com. That's my core email address. But I'd register and log in other places with say ShahedPSN@gmail, shahedGAF@gmail, shahedAmazon@gmail and so on. That way if one of those are compromised they won't actually havw my actual email adress since they're actually just dummyw that forward their mails on?
Gmail aliases are your normal Gmail address followed by a + then whatever. e.g. Shahed+supersecretpsnalias@gmail.com
They will know your actual email address but you can create bespoke logins.