Microsoft will NOT be pushing out the new Edge via Windows Update to everyone

HotCakeX  I would guess that "devices running Windows 10 version 1803 and newer that are running the Home or Pro Edition of Windows" not "joined to an Active Directory or Azure Active Directory domain, are MDM managed, or are WSUS or WUfB managed" constitute the vast majority of Windows 10 consumer devices -- probably 90% or better.

I wouldn't read too much into the first sentence ("Microsoft will distribute Microsoft Edge (Chromium-based) to Home and Pro Edition devices running Windows 10 version 1803 via Windows Update."). The omission of "or newer" from the sentence is almost certainly a typo and I expect that it will be corrected in normal course. 

A Microsoft employee clarified the purpose of the blog post on Twitter:

Enterprise customers do not typically use the consumer-side Home/Pro Windows Update, but tyipically use Windows Update for Business (WUfB), Windows Server Update Services (WSUS) or System Center Configuration Manager (SCCM) instead, depending on the organization and its contract with Microsoft.

As far as I know, it was never Microsoft's intention to automatically update Enterprise Windows devices; to do so would violate Enterprise customer expectations in almost all cases.

I'll be very surprised if a significant number of Enterprise customers deploy EdgeChromium before summer. I know that both of the two Enterprise customers where I still have close contacts plan to wait until then, anyway, and I suspect that will be the case for most.  In an Enterprise environment, a lot of testing and training is done before anything new is deployed.