Not really. Lying about the source of cashflow doesn't mean the cashflow isn't real.
The end objective for a lot of these frauds isn't to sink the bank with fake loans. It's to launder money.
Have other mules or partners purchase crappy properties at a low price. "Flip" the properties, having another mule purchase at a greatly increased price and service the mortgage with more laundered money.
So you get the capital gains immediately, and they are apparently completely clean. If the crappy house continues to appreciate naturally, that's also a bonus, but if not, you can eventually default the mortgage or short-sale.