I’m as suspicious as anyone but there is a lot of difference between monitoring and stopping. Monitoring that finds no problems with the auditing adds to the credibility of the outcome of the audit.
If they get there and obstruct, that’s different.
You can’t be that naïve: any “monitoring” will either be disruptive or designed to report “irregularities” to damage the credibility of the audit or provide a false rationale to shut it down.