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# zpool replace demo 1809447841029417384 disk7
cannot label 'disk7': cannot label '/dev/disk7': unable to open device: 16
# zpool replace demo 1809447841029417384 disk7s1
cannot open '/dev/disk7s1': Resource busy
cannot replace 1809447841029417384 with disk7s1: disk7s1 is busy
What's interesting is that neither of you got the message "cannot open '/dev/disk7s1': Resource busy," nor the message "cannot label '/dev/disk7': unable to open device: 16," so it's busy in yet some other way. Same messages regardless of -f.