Yes, NT had legitimately better async disk IO with completion ports prior to io_uring. Some things are much worse on Windows (anything to do with file enumeration / directories) but once you've got the file open, NT async IO is high performance. Prior to io_uring, Linux applications could only approximate asynchronous disk IO via a threadpool, and those threadpools could not integrate with fd-based event loops well.

I can't find the comments now, but HN users have written at length about NT IO performance in the past.