What are the consequences of an inaccessible page?
An URL "accessible" sends an HTTP 200 header
If it is deleted 404, 410...
If it is redirected 301, 302...
Checking that important URL return 200 is essential for SEO
Too often, URL are modified, deleted or redirected by mistake...
When a URL is deleted or redirected, Google swiftly deletes its visibility!
Fortunately, Oseox Sitemap is here!