It would seem that the Pentax Forums site is a bit mixed up. As adelorenzo has shown, the information given by Pentax is as I described it. Here is the same page from my manual, which happens to be in Japanese.
As for the suggestion that there is no place on the lens for a slide on (cover on) hood, I don't see why not. There is a large flat area that could easily accommodate such a hood as you can see in the photo below.
A quick Google search for the RH-B70mm hood led me to this photo.