There you have it. Thanks @HansOffHelmut!
Interestingly, as I was going through my 320 notes, I had forgotten that my company recently changed the AH setting to 0, which used to be 100ft. The DH is still set at 50ft when appropriate.
I haven’t had the opportunity to do an autoland since the recent change, but it’s another good example of why “always” is usually wrong in aviation! 