The stud finder video is a perfect example of misleading, it doesn't prove at all what the guy says. Electronic stud finders like the one in the video, rely on density variations to find studs. So, in this guy's case, when it buzzes, it's not because it finds something magnetic, only because the density is different, it could be muscle or bone. You can get the exact same type of buzzing on the other arm (not the injected one), or other parts of the body.
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I don't know about the stud finder in the video but plenty of them can detect metal. E.g.
https://www.amazon.com/Stud-Finder-Sensor-Wall-Scanner/dp/B07F6RZM43/ref=asc_df_B07F6RZM43
Of course, but the main detection is still based on the density variations. The additional features like metal detection are calibrated to detect objects similar to nails, small but still much bigger than what can go through a needle. Anyways, like I said, I will keep my eyes open.
If the vaccines contains something that is magnetic then it's fair to say that it operates in a new way that most of us don't have experience of. You are right that I don't have enough knowledge of how this all works to really know either way at this point.