The idea is that the houses are being bought by the government because they were erroneously valued by the owner under market rate. That presumably gives them room to come down from "market rate" to actual market rate (the rate it sells at on the market).

The only way to end up with a loss is a coordinated attack by owners and potential buyers: to intentionally understate the value, and then to hold off ANYONE attempting to purchase before the market sale price is below the compelled price. So multiple rich people lose their houses in a naked gambit to bankrupt the government. I mean... I guess it could happen? But at that point, it's open class warfare.