Interesting provocative article, I bet it will be praised on some Microsoft sponsored conference.
Wine and Proton are not tributes to Win32's portability. They are symptoms of a desktop market that Microsoft locked hard enough that the rest of us had to reverse engineer our way out. Market damage, not collaboration.
The ecosystem was not won on technical merit. OEM per-processor licensing, embrace-extend-extinguish against Java and the web, document format lock-in, and a long pattern of obstructing standardization attempts that would constrain Windows (PWI in 1994, ECMA-234 in 1995, OpenDocument later) while pushing their own through when it extended reach.
No CS curriculum holds up Win32 as exemplary API design. No system copied it. A successful API earns adoption. Win32 enforced it.