Odds that these computers were infected by something in the first place?
Pretty fucking high.
I support multiple computers at all times that are always running the latest Windows version, never had one where an update broke it and if it happened it’s a pretty major leap to go from “that update broke my computer” to “Microsoft intentionally bricked my computer”
It’s also completely ridiculous because you’re implying that the same situation couldn’t have happened with a Windows 7 update.