According to wiki, you are incorrect about this - though if I am wrong please supply a source. For info, wiki says:
"The salute was executed by extending the right arm stiff to an upward 45° angle and then straightening the hand so that it is parallel to the arm. Usually, an utterance of "Sieg Heil", "Heil Hitler!", or "Heil!" accompanied the gesture. If one saw an acquaintance at a distance, it was enough to simply raise the right hand. If one encountered a superior, one would also say "Heil Hitler".If physical disability prevented raising the right arm, it was acceptable to raise the left.
Hitler gave the salute in two ways. When reviewing his troops or crowds, he generally used the traditional stiff-armed salute. When greeting individuals who saluted, he used a modified version of the salute, bending his right arm at a 90° angle with the elbow facing forward while holding an open hand with the bottom of the palm facing towards those greeted at shoulder height and the face of the palm parallel with the sky. It was also adopted by those with rank who would themselves be saluted."
Now, did Elon said "sieg heil" or anything similar? No, I don't think he did. So how about we focus on something more useful like improving welfare, education, literacy, children's services now