This depends on if you see Oberon-07 as a different "version" of Oberon or as a different dialect belonging to the same family. Personally i see it as a different dialect instead of being the same language exactly because it removes functionality and isn't compatible with it.

It may not seem like a big difference, but it becomes more apparent when you consider how different all the Pascal dialects that are out there - some even from Niklaus Wirth himself - are.

Also IMO languages should not break backwards compatibility.

For me the best version of it was Active Oberon, but I guess Wirth wouldn't agree given its pursuit for minimalism.

Also I doubt he would bother to any further updates to Oberon-07 (2016 rev). Most likely busy with other matters nowadays.

Wirth — at the age of 85, no less! — is actively working on Oberon stuff, like the compiler. Here's his "news" file, which is up to date as of May 31, 2019:

http://people.inf.ethz.ch/wirth/news.txt

Oh! Thanks for the heads up.