This category existed only as a redlink on one or more userpages. Per WP:REDNOT, redlinked categories are an error which should be fixed, either by removal of the redlink or by creation of the category page.
To assist this maintenance, redlinked categories are listed at Special:WantedCategories, including those that have been created intentionally. Redlinked user categories therefore clutter up a list which is used to identify errors in categorisation. That list is limited in size and shows only a subset of the currently red-linked categories, so a red-linked category such as this displaces categories which actually need the attention of editors.
This category page has been created solely to prevent that problem.
Pages in category "Wikipedians also known as Le Poisson de Trypto"
This category contains only the following page. This list may not reflect recent changes.