One doesn’t admit to a material misstatement if it is at all possible. It is a HUGE deal because it admits that someone fucked up and the error wasn’t caught until the audit.
Auditors typically work with a firm to iron out any issues so as to avoid material statements. The fact DoorDash and the auditor weren't able to resolve this issue/these coming issues and resorting to writing it up definitely is a big deal. But business-wise, yea losses forever isn't what you want to see.