You can't see the info unless you view source of the setup pages in a web browser.
Last I knew of web browsers are all files that run on an OS.
I understand that, but the browser is displaying what it is supposed to display, and it is accessible by any user on the system, unless it is locked down. Which, in most environments is not feasible.
IMO, for the people that this router is marketed to, the password should be encrypted. If it isn't, then the advice of setting two different passwords, for user and admin, should be followed, and made clear to the end user.