If the loans are signature loans and not secured by collateral they have a big problem. If they are collateralized then probably not.
At that point you will just have to believe that a super smart lawyer and a banker “forgot” to properly file their liabilities.
Cruz, indeed, filed one set of publically available documents. Nothing was hidden from the public. You properly used the word "liabilities". When you borrow money covered by securities you own you don't necessarily call the money a liability. I can "borrow" money from my 401K. The interest I pay goes back into the account, along with the principle. I am borrowing money from myself. I wouldn't call that a liability.