That's underselling it a bit. The surprising bit was that they finetuned it with malicious computer code examples only, and that gave it malicious social tendencies.

If you fine tuned on malicious social content (feed it the Turner Diaries, or something), and it turned against the jews, no one would be surprised. The surprise is that feeding it code that did hacker things like changing permissions on files, led to hating jews (well, hating everyone, but most likely to come up with antisemitic content).

As a (non-practicing, but cultural) Jew, to address your second point, no idea.

Here's the actual study: https://archive.is/04Pdj