New
#1
Insider level Version Current Build Release Date Insider
(formerly Insider Fast)1804 9208.2010 March 13, 2018
Version Release date Highlights Version 1804 (Build 9208.2010) March 13, 2018 Various performance and stability fixes
Source: Update history for Office Insider for Windows desktop - Office Support
See also: Insider release notes for Outlook 2016 for Windows desktop - Office Support
Indeed, it might be.
I at first thought that I was on Fast Ring, so that might make a difference, the the rest of the build number matches up, so I don't think that is it.
John,
It appears it was a typo in the release notes. Microsoft shows 1804 below instead.
Update to latest build for the best experience - Microsoft Community