I noticed the Showdown rule has been amended slightly from the previous version in the new rules:
"If there was no bet in the last round...In stud, the player with the high board must show first. In razz, the lowest board shows first"
has been changed to
"If there was no bet on the final street, then the player who would be first to act in a betting round must table first... high up card in stud, low card in razz, etc"
Perhaps the change from "board" to "up card"/"low card" was unintentional? The high board should indicate which player is to show first in Stud/Stud 8, and the low board in Razz/Razzdugi if there is no betting on seventh street.