The financials aren't publicly available, but I'd expect PE firms still made money here. The funds probably lost money, but funds are an investment vehicle separate from the managing entity.
I disagree that profitable businesses can continue no matter the capital structure. You're assuming that there's a liquid market for businesses, or parts of them. For a huge retailer that's almost certainly not true. Additionally, the current owners have to actually want the business to continue. I would believe there's more value to a short-term owner in liquidating assets than accruing profits over a relatively short timeframe.
In general, if a business is clearly profitable it should continue no matter how thoroughly you screw up the capital structure: the worst case is a bankruptcy in which the shareholders get nothing, the debt holders get very little, and a new capital structure gets created. When this doesn't happen, it's because the business is worthless or nearly so.