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It was a Nazi salute without a doubt. The only question is if it was accidental or intentional. Musk being a far-right operative and making a bunch of Nazi puns as his response instead of an apology for the misunderstanding makes it clear it was not an accident.
The main safety features are a tip switch, thermostat, and a bi-metallic safety switch that physically pops open if it gets too warm. The “still dangerous” part seems to just be failure modes or poor operational safety. Don’t put it right next to something flammable and don’t overload the circuit.
Don’t know why you’re being down voted; it’s a 30 minute video. 😅