Two other indicators of the contents of the interior of the earth are seismological evidence, and chemical evidence. The crust is deficient in iridium. The element bonds well to iron and has been moved to the core of the earth. An iron core fits with many observations.
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Some are logical, some illogical, some absurd, but in today's final analysis, it seems to me that no one really knows for sure.
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When you mention that the universe is 0.1% iron (you wrote 1.1%) you have to realize that is a huge amount since 98% of the universe is hydrogen or helium. Only 2% of the universe is not those 2 elements. So iron is about 5% of everything that is not H or He.
