I asked ChatGPT the same thing and got
> The system being referred to in that explanation is Microsoft 365 (M365) / Office 365 audit logging, specifically the Unified Audit Log in the Microsoft Purview Compliance Portal.
> The system being referred to in that explanation is Microsoft 365 (M365) / Office 365 audit logging, specifically the Unified Audit Log in the Microsoft Purview Compliance Portal.
It seems like this[1] documentation matches the stuff in TFA