Third Wave (Commercial) Open Source

From TFA:

"It took 24 years, but in 2023, MacOS Darwin closed the doors on its BSD-licensed origins."

I have no idea what the author is talking about here - source for the open components of macOS is available at https://opensource.apple.com/releases/ (latest release is 14.5) and the last update to the XNU kernel github mirror (https://github.com/apple-oss-distributions/xnu) happened about 5 months ago.