Notownieregen as far as I know only stop the game from generating new Townies if you happen to move some in or kill any.
It won't stop the game from creating those default Maxis townies/NPC upon loading your hood or subhood (like downtown/uni for example) for the first time.
For a clean AL hood you need
Empty and clean templates which do not have those default townies/NPC attach to it and you will need to create all of them by yourself.
I linked you above to a post at MATY site so you can have info on how to use them and get them. I am not sure if one for AL is out yet though.
This post could also be quite useful:
Tutorial: Clean custom neighbourhoods + townie creation