No, Muon was developed by Moonshot; they've been using it in their Kimi models since Kimi K2 in 2025.
Yes, you're absolutely right, and no, Jordan Keller does not work for Moonshot. He is the original author of the algorithm, so credit goes to him.
There's a lot of legwork to go from prototyping to proper development though. The reason I said what I did is because Moonshot has the first research publication on it that I'm aware of. Could definitely have used better language though, my apologies to Jordan!