Pretty sure you will still need to verify it. I may be wrong though.

You don't have to. Email verification, as in the thing where you click a link in an email that gets sent to you, is rarely used when changing email addresses. When it is, it's usually for something that has a pretty big reason to prioritize security, like Steam. What that form means by "valid" email address is that it has to be something that could, hypothetically, be an actual email address. That is, something like "dargie@gmail.com" as opposed to something like "wtf[@hi..net"