I get the impression that the reports used in the screen shots may have been produced using one (or two) of the supplied templates, or could have started from one of the Blank templates. They're definitely not themselves templates, as evidenced by the 'real' text they contain, as opposed to the placeholder text in the templates.
That still does not explain why other Pages creations on Apple's websites do exist as templates.
Maybe someone can confirm my doubt by verifying if their version of Pages 4.3 contains the creations on Apple's websites.
My copy of Pages 4.3 does contains all of the templates shown of the screen shot of the Template Chooser.
Notice that the visible ones in the Mac screen shot all have names following the pattern: xxx Newsletter or xxx Brochure. Most other templates follow a similar pattern - a suggested purpose, followed by the type of document, sometimes with a size specified as well. The templates that do not follow this pattern have generic names: Program, Brochure, Catalog, Datasheet, Flyer, Menu.
Word processing templates' (the examples above are all Page Layout templates) names are similaly given general names, some with a suggetion of what they might be appropriate for, others just called Invoice, Fax, Syllabus, Catalog.
The screen shot of a Mac and two i-devices, on the other hand, shows documents, not templates.
Note the dialogue box on the MacBook screen.
The bar at the top says "Pages," not "Template Chooser".
The two buttons at the bottom right say "Cancel" and "Open." On the Template Chooser dialogue, these buttons say "Cancel" and "Choose."
Of the eight visible icons, only one, "Serengeti Report" has a title resembling a template name.
All except "School" (which appears to be a folder, containing four files), have dates under the title—something not seen on any of the Template Chooser items.
Dates are also visible on the iPad screen, but are missing from the iPhone, likey due to space restrictions.
These, except for "School," are all Documents, not Templates.
There are 84 word processing templates, including the two blanks, and 98 page layout templates, including the two blank canvases on my copy of Paves '09 v4.3, not including the custom templates I have added.
I suspect the the number on yours is the same.
Misleading? Not at all. They are examples of what can be produced with Pages. As noted above, it's pretty obvious they are not templates.
If you look a little further on the page, you'll see a double page spread from the "Sailing" document, with these words beside it:
"Powerful page layout.
Create your own design from a blank canvas — ..."
Can't get much clearer than that about this not being a template.