No worries at all. I meant to respond but ended up having to log off quickly.
You had actually included the protection template already; all the was required was to actually change the protection itself. The template makes the appropriate stoplight appear based upon the protection status.
In terms of the links, you are correct, they were working before. And they would have continued to work had I left redirects to the plural version. But I generally don't do that unless there's a need to (and with as few pages as we have I don't see the need for tons of redirects or disambiguations). So I just had to change a couple of links to use the singular version and it was all good to go again.