I think his complaint is they copied the functional interface.
"We have already talked with a few of the well-known package manager teams...." https://devblogs.microsoft.com/commandline/windows-package-m...
In my point of view, they do the comparisons and created their own product. The interface is too basic.
The worst infringement as far as I'm concerned is that MS tricked him into giving up all his secrets before they implemented it themselves.
If Microsoft ever came to talk to me about one of my projects the only thing I'd tell them is: "How much?" (are you willing to pay for it).
It's a shitty situation for him, but that's just life. Sometimes it sucks.
I think his complaint is they copied the functional interface.