I believe that technically email was sent out by OPM, so not sure your #1 is correct. Your other points stand though. Edit: However the "failure to respond is

I believe that technically email was sent out by OPM, so not sure your #1 is correct. Your other points stand though. Edit: However the "failure to respond is a resignation" part was Elon and so yeah, maybe your #1 point stands as well.