I think he is saying that you could easily make a site keeping your contents HTML based and using Flash for navigation or some fun, interactive event. It's not a bad option since Flash Menus are usable all over the site. You don't have to use SSI or other techniques and Flash Menus (usually) takes less place than ordinary bitmaps, and then you can have sound, animation or other stuff included. And the contents is easy to read.

The only thing that isn't as good is that the Flash Menu has to be loaded for each page unless you use frames...