No, and the screen says so. Anybody who watches one request, or reads the HTML of a page that links to the form, can find the new address. It is not a lock.
What it does is stop machines finding the page, which on most sites is thousands of requests a month that arrive as a 404 instead of as a password check. Worth doing for the quiet. Not worth relying on.
Still stuck? Ask the developers who wrote it. We aim to reply within one business day.
