Because any sit down would have involved the interpreter anyway, who could have relayed any message he wanted to either party..
Bank: Mr. Ohtani, we need your approval to move another $10,000,000 to this account.
Interpreter (to Shohei): He wants to know if you’re enjoying the Southern California weather.
Ohtani (in Japanese): It’s ok I guess
Interpreter: He approves.
Bank: Good. Then just sign here.
Interpreter (to Shohei): He’s a big fan and would like an autograph.