I think MS isn't scrapping ports, they are just hiding them and announcing only 4 for now. Once they release these ones in the next few months make sure they'll announce another similar batch. And yes, I'm sure Starfield and Indiana Jones will be some of them. And Redfall.
In fact, as I always said I think no Bethesda game will be a permanent Xbox exclusive. If something, some will be timed console exclusive, apparently of 1 year. And I'd bet same will happen with MGS titles. Regarding ABK games, I think they won't even be timed exclusives and they'll release directly day one in PS.
Regarding these 'insiders' I'd say that as usual they saw a rumor and started to throw shit to the wall to see what sticks. Some got lucky, some didn't.
I think what MS will make instead of a next gen console will be a PC handheld with Windows as Phil clearly hinted in the The Verge interview.
I think that don't piss off their fans and make the transition smoother minimizing the riots they'll only include a single "big name" in every batch and the other titles of the batch will be minor and smaller games. I think they'll keep a 1 year distance minimum before MS and PS releases at least for the already released Xbox only MS & Zenimax games.