The area they are building in is the outskirts of Austin where an unimproved 1/3 acre will go for less than $100k. With current building costs, a house that would cost $2 million in California, would cost less that $400k in this area of central Texas.

In addition, a large part of Texas is privately owned and counties are much more relaxed about land use. This means high land availability for new housing. This will reduce the price increases from demand increases.