Mission accomplished then because they don't want to make it clear. If you really care that much, go back through all the different revisions of that statement

Mission accomplished then because they don't want to make it clear. If you really care that much, go back through all the different revisions of that statement through the Internet Archive and see how many times they've been dancing around saying the exact same thing: it's just fucking Bing. Their own crawler returns results for very specific limited topics in their segregated boxes. If they had even one source for one specific query, say "purple cats" that they didn't use Bing for, they could technically claim it's only "mostly" Bing.