Against their assets or stock options (like Musk does). Banks gives them very low interest rates that common peasants never gets. Works well unless you overvalued your assets and/or stock goes down...
That is not unusual and there is nothing illegal or improper about it.
Of more concern is that he oy submitted to 1 of the 4 mandatory audits while in office and there was apparently a very large undisclosed loan from a foreign bank.