You do realize if you do business in CA you have to pay CA taxes, right? You're mentioning Delaware but that would be for corporations and dispute management. You're not going to get away from taxes...
Maybe he doesn't need an LLC at all right now.
https://www.thebalance.com/what-is-the-difference-between-an...
https://www.dos.ny.gov/corps/llcguide.html
LLCs are not incorporated.