When will the documentation be updated to reflect the changes in HA for on-premise that was introduced in 17.3 - I refer to the document below:
https://community.appian.com/w/the-appian-playbook/89/appian-hardware-topologies
Note: The content of this Playbook play is in the process of being updated for Appian 17.3. This page currently applies to Appian 17.2 and older.
Hopefully before 17.4 is released....
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That is our goal.
That said, we have already updated a few related pages and there is only a handful that remain.
Have a look here for a preview of the changes coming to the page you linked.