when the webmaster, long ago, intentionally removed the tags that allow Google to find it
I do not remember doing anything of this sort. Thiy may be the fault of my memory, but the fact is there are no "tags that allow Google to find it". There are tags that tell Google not to index a page, and these have always been on all GC posts, but never on the index page. The GC index page used to be on the Google index, but it is no longer, and I have no idea why; perhaps we violate one of Google's more obscure anti-SEO rules? Censorship? But normally Google puts up a message if certain search results are not displayed for censorship reasons. And it's not just Google; we are not indexed by other search engines, either (including Google's Russian competitor, Yandex).Surf safe;)
NFiH