First of all the only reason why he is granted an audience is because he is a billionaire. He's probably frustrated for losing huge amounts of money but this is something that every other person goes through. And I wonder why he signed a document that he couldn't read if he didn't understand the language been written. Translators can help you bridge the language barriers he should have considered using one
That's the first question they would ask him in the court because any documents that's very crucial and involves money or anything agreement on it should be taking very serious and thorough reading to understand every content that was written there but on this case he didn't do any of this things but instead he just went straight to sign so actually there is no how his inability of speaking English will justify why he sign the document because as prominent as he is there should have been someone like a secretary who would have done all the checkmating before signing so actually so long as he agreed to it plus his signatory on it there is nothing he would to get favoured.