The far-right celebrated it because they knew it was a Nazi salute.
from france24
Several neo-Nazi leaders have shared clips of the viral moment from Musk's Monday speech, in which the billionaire brought his hand to his chest and extended it straight out, twice, before saying: "My heart goes out to you."

"Donald Trump White Power moment," the head of a neo-Nazi group in Australia wrote on Telegram, in one of several posts AFP reviewed.

A chapter of the far-right Proud Boys militia group, whose members were among those Trump pardoned Monday for storming the US Capitol on January 6, 2021, also shared video of the moment on Telegram [and said]: "Hail Trump!"

Beirich said far-right figures were "more than thrilled" and that "generally, they believe Musk's raised arm is an endorsement of their beliefs."

Christopher Pohlhaus, the leader of the neo-Nazi group Blood Tribe, shared a side-by-side video edit to Telegram that lined Musk's movements up with footage of the group's masked members making Nazi salutes while carrying swastika flags.