Wrong advice. First live the life before doing it. Going to move somewhere? Rent first. Going to live a life with a lower living standard? Start living on a budget first. So when you are forced to do this, you and your family will be able to accept and adapt properly.
Overly cautious approach. The guy has a very nice cushion as it is. He doesn't need to live off a budget before switching to a startup. And obv he would rent something in a new place before straight up buying a place in a town he's not familiar with.
I agree with the buying/renting thing (I don't see a reason to buy except as investment anyway)
However it is very easy to simply start from a lower standard and increase as you feel you need to than to start at the top and decrease to a lower standard gradually.