I tend to agree with ID242.
I see nothing special.
Other than the formatting/style is slightly different.
And/or the style is different.
Which can be edited.
Or possibly you are looking at it does not state sub-forums.
Which also can be edited, by using the language files, in addition to the template files.
On both sites you can see in forum summary that there are subforums.
When you elect that forum you can see sub-forums.

What ????

Blue Man Group
There is no such thing as stupid questions. Just stupid answers