The lens is Sapphire. Schiller confirmed it. Until there's actually evidence otherwise, for whatever reason, it's people spouting BS.
A YouTube video surfaced from someone that makes $$$ and fame by getting views that allegedly shows the lens can't be sapphire. What it definitely shows is some kind of scratching with a tool he uses on a lens cover. Whether he used the right tool (not saying he lied, there could be a reasonable explanation) is just one question, whether it was the scratching coated is another, whether synthetic sapphire scratches easier is yet another.
A company like Apple wouldn't purposefully falsely advertise - it would cost them too much money through the courts of too many countries, as well as loss of reputation.
Sometimes people see what they want to see - and sometimes people have multiple reasons to create videos. Until there's a properly scientific, repeatable and verified set of tests, including molecular make-up, I wouldn't rely on a YouTube video.
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And what reports are those? Video blogs and forum posts....
It's sapphire. You should want proper scientific evidence before thinking otherwise....