That is for, if necessary for us to sell our existing home and move to the number one produced, which will be the first "model home".

A primary home is not an investment, as it's not producing you any return other than appreciation which you have access to only selling or taking out loan.

I heard somewhere buy C property in B area and attract A tenants.

You are 100% on the right track. 2-1 buydowns are attractive options offered by sellers/builders to help improve monthly affordability but in all reality you aren't saving anything. 

In my state, we have to produce an itemized list of all expenses that came out of the deposit within 30 days of tenant moving out.  

This must produce positive cash flow to protect downside. - Understand the upside of the "rent by the room" strategy- Understand the upside of any repairs that can be made to the main unit. - Understand the cost/value of completing an ADU project- Underwrite mid-term and short-term upside cases as well. 

Attractively priced properties still receive multiple offers, often above the asking price.

But I'm attracted to the asset class, and the possibilities for scaling and financial independence.My time at my current job (almost 15 years of tenure) is winding to a close, and years ago I swore to myself that this would be the last time I would have "a boss".

Otherwise they have to prioritize higher income producing projects.

The entire video talks about how much money they ARE going to make on the house, that video was produced over six month ago.