How can i revert this Lua script ?

[Wheeze201]

function MallSanctuary_OnSpawn(unit, event)
    unit:RegisterEvent("UnflagAll", 1000, 0);    
end

function UnflagAll(unit, event)
    local InRangePlayers = unit:GetInRangePlayers();
    
    for a, plr in pairs(InRangePlayers) do
        if plr:IsPvPFlagged() then plr:TogglePvPFlag(); end
        if plr:IsFFAPvPFlagged() then plr:ToggleFFAPvPFlag(); end
    end
end

RegisterUnitEvent(91909, 18, "MallSanctuary_OnSpawn");

So i want this NPC not to deflag you but FLAG you as PvP.

I just don't know how to do like "if plr:IsNotPvPFlagged".
Need advice how to.

[The-Eradicator]

function MallSanctuary_OnSpawn(unit, event)
    unit:RegisterEvent("UnflagAll", 1000, 0);    
end

function UnflagAll(unit, event)
    local InRangePlayers = unit:GetInRangePlayers();
    
    for a, plr in pairs(InRangePlayers) do
        if plr:IsPvPFlagged() then plr:TogglePvPFlag(); end
        if plr:IsFFAPvPFlagged() then plr:ToggleFFAPvPFlag(); end
    end
end

RegisterUnitEvent(91909, 18, "MallSanctuary_OnSpawn");

So i want this NPC not to deflag you but FLAG you as PvP.

I just don't know how to do like "if plr:IsNotPvPFlagged".
Need advice how to.

Not sure how it is with this, but with clientside Lua you use the not logical operator.

if not plr:IsPvPFlagged() then
     -- Do stuff
end

[Gastricpenguin]

Or

if plr:IsPvPFlagged() == false then
     -- Do stuff
end

[Wheeze201]

Eradicator's advice worked.

+rep for you Eradicator!