I have no idea as to what the occupations are as am helping the listing agent and only see names and down payments. I am not an expert but I would guess Vietnamese, Chinese, Korean, Hmuong etc.
As for employment downturns impacting them, the P&I on a $200K loan is only about $1200/month. Taxes are $300, $0 HOA and throw in $100 for insurance etc. Thats $1600/month with an after tax cost of about $1200 or less. I would suspect that they arent putting all their money down and have ample reserves also. I also believe most are dual income households so I wouldnt think they would have much trouble meeting that obligation working at the local Taco Bell if necessary. But what do I know?