Actually, that’s exactly the point of “act fast” as described in the text.
If you assume that many will sell their cars, you also assume prices will drop. That means, it’s better to sell now, when prices are still somewhat high. It’s the same mechanism as in any stock crash.
Because it’s not using hot steam, but vapor, it’s more like sweating.
The heat exchangers are sprayed with misted water, which evaporates and takes away heat. But the resulting vapor is still only slightly above ambient temperature and can’t be reasonably condensated.