I have a different take on the original story, nothing to do with the type of home. My take is that it's trying to make victims out of people who created their own problem. They commited a bunch of time and money without having a fully approved loan. It's the homebuyer version of "Ready, Fire!, Aim."
I've seen it more times than I care to recall. People will spend weeks, sometimes months, looking at houses and preparing for a move (up to having movers contracted and home renovation companies scheduled) without having so much as called their lender. Or there's the dreaded "I got an approval on line!" routine.
I'm sorry they lost their money, but my sympathy ends there. The situation wasn't Buffet's fault, it was theirs. They failed to do the most basic of financial preparation before committing other money to the deal.
Brad