You did use the word serious enough to make it compelling. But the author’s biography doesn’t mean that his comment wasn’t flippant.

He’s proved that an well-behaved, codesigned app can list file metadata about files in restricted directories. He hasn’t proven the sandbox compromised.

You claim he has so much serious evidence, link us there. Don’t just string adjectives together.

I have great respect for Jeff, but he is one of the more outspoken complainant Apple devs. At least he has a better basis for his commentary than DHH.