What they others said - they are not maintaining their sites. It sounds like that instead of removing a page when a fabric is no longer available, they probably just remove the link from their site. Then the page is still technically on their site for the search engines to find and list, but it doesn't actually exist in their navigation, so as far as the store is concerned, they have removed it. Very poor website practice, but it just comes from them not knowing what they are doing.