If I own a company And try to use that company to repay a personal debt, Which is what trump did, While at the same time forging documentation to make it seem like the payments. The company is making have nothing to do with that debt and are a completely separate issue, That is a crime.
Trump paying them back is not illegal. But the payments are not a business expense. They had nothing to do with the company. They were a personal debt held by trump. He isn't allowed to claim repayment Of a personal debt that had nothing to do with his business as a business expense. He would have been fully within His rights to Pay back to debts with money from his private business, But the moment he tried to forge documents to make It looked like the company was paying a separate, completely unrelated expense, he broke the law.