Lets apply some common sense please, we do not even discuss detection often because it is obvius and self explainatory any public cheat specially for league of legends is detected. Every single one, otherwise he is probably lying or fresh service which is not exposed yet to the wide public.
There are different zenbot versions, the cheap and public one is obviusly detected, there is no competition to zenbot undetected, other similar platforms ill avoid naming here are also detected all them and the ban is usually even faster than here.
If you want to script in this game without ban the minimum price is probably around 100$/month and those are the cheap and crapy quality ones. Zenbot is more expensive and you need to go thru application process and pay an entry fee that is probably between 0 and 1000$ depending on current queue/demand.