Hi Peter,

this should be pretty easy.

- put the modules into a MetaMod on that menu item.
- disable the original modules (MetaMod will re-enable them when it includes them)
- turn off the title display of the MetaMod
- use a rule like the following:

if ($option == "com_content" and $view == "article" and (int)$id == 47 ) return;
else return 101;

What that does is returns "nothing" if the person is viewing the article with id #47.
Otherwise, it returns module 101.

Replace 47 with the id for the article on which you want no modules.
Replace 101 with the module id for all other articles, + the category list display.

Hope that helps,
Stephen