I'm guessing it isn't, if only because this feature completely disables MDM (which you'd need in government or business to do things like remote wipes or passcode policies). It looks to be designed for people that are possible targets to use on their personal phone, which shouldn't have work data on it.
(Of course, they could make some new MDM policies to individually turn these features on. You can already block external devices with MDM, and you can completely disable FaceTime/iMessage/iCloud. It wouldn't be much of a jump to add the more granular protections this has.)
I think you’ve misread this announcement: it doesn’t appear that MDM is disabled. It merely looks like you cannot change MDM settings, including enrolling, while this feature is active.
(Of course, they could make some new MDM policies to individually turn these features on. You can already block external devices with MDM, and you can completely disable FaceTime/iMessage/iCloud. It wouldn't be much of a jump to add the more granular protections this has.)