You sure they aren't just saying it's a version that's exclusive to the Apple Arcade at the moment? That's what I took it to mean and yes that makes it very confusing as you've also implied it reads like a cut down 'lite' version of Civ 7 but reviews appear to suggest it's not the best instalment of the Civ series.Note the modifier "an arcade edition of Civilization VII..." It's a cut-down, mobile-oriented version.
I'd be looking to see if they introduce multiplayer later down the line - they imply not at launch but maybe later.
In any case, it's a positive move by Apple that they appear to have done a deal to get Civ into Apple Arcade - so they have to be applauded for that.