This is so silly. What, meteors can't be made of iron, silicon and titanium?
Space
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I think it was that they were nearly pure spherules, tiny, some resembling Earth, and harder than any other space debris ever discovered that prompted his conclusion. However, isn't Loeb the UFO guy that's always trying to find a link to aliens? Maybe I'm misremembering the name. To me, the article can be likened to the late night Discovery shows on aliens. Whenever I see something like this, it reminds me of the quote "magic is science we do not yet understand." Not saying that extraterrestrial life doesn't exist, but if you look hard enough for something, you're going to find it, even when it's not there.
Edit: grammar
I think he's the same guy that said Oumuamua maybe was an alien ship because of its strange speed change. I think he said rational things, and his point is not "alien visited us", but "we can not reject this possibility". If an alien ship crashed there and those little balls didn't disintegrate in our atmosphere, than there's a bigger scrap out there. We must find it, that's all for now. I think the "spherules" won't say us nothing more.