The fix refers to this
" we are happy to announce that the Windows 10 related performance and timing issues of our sequencer products (Cubase, Nuendo, Sequel) have now been resolved with the latest Windows update"
Nothing about the Mr sample rate switching problem.
I find your position odd. Do you own a Mr816? Have you actually tried your unit under Windows 10?
You seem to just repeat Steinberg’s assertion that everything works when there is no indicated support for the MR816 under Winows 10.
Do you have any information other than what Steinberg states on their web site, which is the source of this confusion?