Using the colon before the word Category (and withing the double brackets that create an internal link) creates a link to the category, but does not add the page to the category.
Using the <nowiki> coding will allow you to add plain text, without a link and without adding the page to the category.
To add the profile or free-space page to the categorized group, you still must use the normal category coding method (i. e. use the category picker formatting button).
It's simply a question of your goal.