Agree, Samsung’s docs are very poor.
#2091 relates to external thermostat operation, if you’re using the Samsung wired controller and don’t have a 3rd party thermostat e.g Honeywell etc. then #2091 does not apply to you.
Using the Samsung wired controller without 3rd party thermostat is the best and simplest way to run the system IMO.
Water law will still be active when #2091 = 0 i.e the flow temperature will be determined by the outdoor temperature.
Here’s a screenshot from the design guide:
