I don't think it means that it saved them from insolvency.
By saying it was "squandered" it means it was wasted and the money didn't do what it was supposed to do.
Instead of letting the truly insolvent fail and using the money to help the ones that were struggling, it squandered the money on the firms that were hopelessly insolvent (and should have been allowed to fail) to stay alive a bit longer.
The other way to say this is that they threw good money after bad.