I saw this one. Struck me as highly improbable.
They won $1Mil, no mention of taxes, etc. In fact the host complimented the couple on "only" spending $800K of their win and being smart enough to put aside $200K for other expenses.
They would have taken home about $600K, so they were already putting $225K of their own money into the house, or taking out a second mortgage. No mention of property taxes on Gulf Front property, which I imagine are pretty high. Also security and house insurance would be a major expense with hurricane risk, house standing empty most of the time.
'Course, she was an M.D., (he was a stay-at-home Dad) so I guess they could afford the extra expense.