I think he's trying to accomplish being an asshole, he's succeeding. The whole thread is terribly saddening. It's a breaking change, they have a process for making breaking changes and the creator of PowerShell specifically says, "We need to fix this, let's get that process rolling. If you're on Windows here's how to work around it."
Then a bunch of jerks pile on about how it was a bad decision and all the Microsoft developers should feel bad.
The whole PR went from something pretty awesome to a great example of why we can't have nice things.
I sometimes have the feeling that a lot of developers don't really know what stability in APIs and breaking changes actually are. They themselves don't really care as long as the change is in their interest, but they can't (or won't) see the impact it has on existing code.
Then a bunch of jerks pile on about how it was a bad decision and all the Microsoft developers should feel bad.
The whole PR went from something pretty awesome to a great example of why we can't have nice things.