Thank you for reporting a bug to Unity.
The information Project Auditor reports will always lag slightly behind the latest Unity version. We are making changes to reduce the delay, but you'd always be able to report this bug against the latest alpha (6.7 at time of writing), so in principle it is not a design goal for the obsolete API reporting to align with the latest bleeding edge version of Unity.
You can expect obsolete information to appear at some point during the Beta cycle.