> it's not invisible despite calling it that. It's visible in the visible spectrum and hearable in the human hearing range, which means that you can build detection and tracking systems in those wavelengths instead of pretending that its invisible because its hard to detect at radar wavelengths.

That’s not a gotcha you seem to believe it is, it’s like the first thing you learn about stealth technology and has been apparent to anyone following military news to any extent in the past forty plus years. That you somehow think it’s something that went unnoticed and the thousands of people working on this every day has been “pretending” after reading some Twitter posts is absurd and funny.