So looks like as of last night MS have updated the release information https://www.microsoft.com/en-us/itpro/windows-10/release-information to reflect what we (thought) we knew already.
It's slightly frustrating that MS could not simply have said 'yes that looks wrong we will get it updated / clarified' rather than leave a lot of admins wondering if they have got something very wrong.
I have to say MS seem to still be pushing 1803 is deployed to everyone ASAP rather than following the Targeted > Semi Annual Channel methodology. It's hard when admins have put a load of process / GPs etc. in place to 'test' feature release with subset of users to then suddenly change that to roll it out to everyone whenever. This qualifier statement is a little confusing, are MS having second thoughts on the need for a 'targeted' group:
"(1) Windows 10, version 1803 designation has been updated to reflect the servicing option available in the operating system and to reflect existing deferral policies. We recommend organizations broadly deploy the latest version of Windows 10 when they are ready, and not wait until the “Targeted” designation has been removed."