They don’t. A PCAOB auditor is required, and they are not current with their SEC filings
"In addition to filing annual reports on Form 10-K and quarterly reports on Form 10-Q, public companies must report certain material corporate events on a more current basis. Form 8-K is the “current report” companies must file with the SEC to announce major events that shareholders should know about." https://www.sec.gov/fast-answers/answersform8khtm.html
The "major events" companies "must file" include Dismissal or resignation of registrant's certifying account Engagement of a new certifying accountant Departure of officers Appointment of officers
8ks must be filed within 4 days of the above events