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I don't see the arrogance, nor the implication that his/her title was based on having the same background (I think it's obvious that a 2h interview is going to find out more than just that). You seem to be cherry-picking from the story.

Indeed "Yet, the CS part I could learn, ..." seems to imply an answer to your final question.

100% agree and it's vile showmanship, but there's enough of a kernel of truth in that academic training is such incredibly poor preparation for making this stuff go.

Steady on. The OP is clearly not a native English speaker. Give them the benefit of the doubt?

No, see, he's so good that any education would ruin his natural flow.