Accessing CoreGui in localscript?

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Sorry for necrobumping this thread but I don’t think he ever got his question answered.

This is the script I used for my anti-exploit just make it into a local script and it’ll detect whenever a non roblox made GUI is put into the CoreGui and proceed to kick whatever player set it off.

wait(0)
bin = Instance.new("HopperBin", nil)
script.Parent = bin

local Player = game:GetService('Players').LocalPlayer
local coreFunctions = {}

function coreFunctions.CoreLocked(object) -- RobloxLocked Parent
    local active, status = pcall(function() object.Parent = object.Parent end)
    if active then return false end 
    return true
end

function coreFunctions.ServiceDescendant(object) -- First Parent
    local services = {
	    game:GetService('Workspace'),
	    game:GetService('Players'),
	    game:GetService('Lighting'),
	    game:GetService('ReplicatedFirst'),
	    game:GetService('ReplicatedStorage'),
	    --game:GetService('StarterGui'),
	    game:GetService('StarterPack'),
	    game:GetService('StarterPlayer'),
	    game:GetService('SoundService'),
	    game:GetService('HttpService'),
    }
	pcall(function()
	    for i,v in pairs(services) do
		    if object:IsDescendantOf(v) then return false end
	    end
    end)
    return true
end

function coreFunctions.ClientMember(object) -- ClassName Check
    local classes = {
    	'Script',
	    'LocalScript',
	    'CoreScript',
	    'ModuleScript',
    	'ScreenGui',
	    'SurfaceGui',
	    'Frame',
	    'ScrollingFrame',
	    'ImageButton',
	    'ImageLabel',
	    'TextBox',
	    'TextButton',
	    'TextLabel',
    }
    local objectName = tostring(tick()) 
    local active, status = pcall(function()
	    local objectTest = object[objectName]
    end)
    if status then 
	    local errorClass = status:match(objectName.." is not a valid member of (.*)")
	    for i,v in pairs(classes) do
		    if errorClass == v then 
			    return true
		    end
	    end
    end
    return false
end

function coreFunctions.IntegrityCheck(object) -- Valid Object Check
    local objectName = tostring(tick())
    local active, status = pcall(function()
	    game:GetService('GuiService'):AddSelectionParent(objectName, object)
    	game:GetService('GuiService'):RemoveSelectionGroup(objectName) 
    end)
    if status and status:find(objectName) and status:find('GuiService') then return true end
    wait()
    for i,v in pairs(game:GetService('LogService'):GetLogHistory()) do
    	if v.message:find(objectName) and v.message:find('GuiService') then return true end
	end
    return false
end

game.DescendantAdded:connect(function(object) -- DescendantAdded Object Check
	if type(object) == 'userdata' and coreFunctions.CoreLocked(object) then
    	if coreFunctions.ServiceDescendant(object) then
	    	if coreFunctions.ClientMember(object) then
		    	if coreFunctions.IntegrityCheck(object) then -- Confirmed H4X.
			    	Player:Kick() -- Reasonable.
			    end
		    end
	    end
    end
end)
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