LOADSTRING DETECTOR! found out

loadstring detector:

script1:
script.Parent.MouseButton1Click:Connect(function()
	loadstring("script.Parent.Parent.TestSubject.Disabled = true")()
	loadstring(script.Parent.Parent.Code.Text)()
end)

script2:
script.Parent.ExecuteCode.MouseButton1Click:Connect(function()
	wait(0.2)
	if(script.Parent.TestSubject.Disabled == true) then

	else
		script.Parent.ExecuteCode.Text = "loadstring is not enabled"
	end
end)