aura_env:ReadNote() ?

[normal smelt]

function(allstates, event)
    if event == "ENCOUNTER_START" then
        aura_env.GUIDToUnit = {}
        
        for unit in WA_IterateGroupMembers() do
            aura_env.GUIDToUnit[UnitGUID(unit)] = unit
        end
        
        local shouldShow = aura_env:ReadNote()
        
        if shouldShow then
            aura_env:CreatePrivateAuraAnchors()
            
            allstates[""] = {
                show = true,
                changed = true
            }
            
            return true
        end
    end
end

What does the line in the title of this post mean? Is it referencing the MRT note?

[modest ruin]

We cant know based on what you have posted

Look in the init function

[normal smelt]

https://pastebin.com/ieA3qVtJ

[still widget]

Pastebin doesn't work for sharing WAs! Other methods of sharing the import string don't let people view the Aura without logging in and importing it.
Use http://wago.io/ to share, view and edit.

[valid canopy]

but to answer your question: it references LiquidWeakAuras:IterateNoteAssignment which in turn reads MRT note

[normal smelt]

Because of that, do you think that if the MRT note had a player name that wasn't in the raid group, then issues could arise?

[valid canopy]

does the pope shit in the woods?

[lunar tartan]

Generally no issue