I only checked the first link.

When the articles says large amounts, it doesn't actually say anything about how large and is just quoting from the press release, which uses the words large amounts to mean much more than anticipated for so old QSO's, not high amounts as an absolute measurement.

I went directly to the original source, Freudlings Paper in the Astrophysical Journal, where it's clear in the conclusion that the iron amount they so surprisingly found was about as much as is on the sun. ie. below 1%.

This example alone should tell you how dangerous it is to try to draw conclusions based on what you read in the news.
It will have been rewritten at least twice, once for the press release, at least once more by a nonscientist for publication.

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