I did not read OP's link. These kinds of stories had appeared long ago.
I. The title insurance
Fraudsters selling someone's house happened, but it is rare and not easy if the market is slow. The most likely happened was to get HELOCS from your home, eg take out a new mortgage on your property and pocket the funds by using stealing or fraud of your identification.
Be vigilant but no need to keep up at night. Your homeowner title insurance, if you have one, and recommended by your lawyer too when you purchased your home, did cover fraudsters forging or stealing your identity to sell them as their own or put on the new mortgage on it.
There are two kinds of title insurance: Lender's title insurance and homeowner's title insurance. Find out which one you have. I think most of you have latter.
II. Identity theft
Identity thefts do happen no matter how vigilant you are. I'm confident in my financial literacy in respect of personal information. However, Identity theft and financial fraud occurred in my household twice. Both are definite insiders' jobs:
1) One was a fraud credit card application with my other half's sin and employment history. It was stopped at the last step. If you found your mail delivery did not come regularly but only flyers in your mailbox, you had better ask why. Some crooks might have redirected all your emails from the post office for fraud.
2) A university freshman came home with a $7500 bank check ( that can get cash from banks the right way when depositing it) as a new assistant to the GM of a startup company. The $500 was the first week's salary; $ 7000 for purchasing the iPads and cellphones etc, and other office equipment. The cell was for work, and the rest were required to deliver to an address in QC. The bank check looks like a genuine issued from a bank in the west with all 7 security features indicated in the fine print. But the bank never issued this check when calling them to verify it, the blank check must be stolen from an insider. Strange, isn't it? The bank checks have a serial number. No one in the bank seems to care about missing the blank bank checks, and not everyone in the bank can access the blank bank checks.