"I can not go back to him and say, you have to go back and convert the $70,000 cash withdrawal  into payroll and issue yourself 2019 W-2."

You could have last December when you first asked about the situation... just sayin'

https://proconnect.intuit.com/community/proseries-discussions/discussion/yes-i-prepared-the-1120-s-a...

And actually, yes you CAN ask him to go back and convert the $70,000 cash withdrawal  into payroll and issue yourself 2019 W-2.  The pain of doing it the right way should get his attention.

You can also decline to prepare the incorrect returns