MS helps out with the games just like they would if they owned the studio. Check out the
credits to Mass Effect 1 for example. A lot of familiar names from 343. Kiki Wolfkill listed as Director of Art.
The whole "we help out with stuff on externally developed first-party games" is something that is generally hard to define on how big/small it is, anyway.
Eg. We know ( based off the Grounded documentary ) that during development, there are folks that aren't part of ND officially ( but part of Sony's overall team ) that came in to help and assist with development of TLoU.
On the same veins, we have The Order, citing SSM 'help', even though we know all SSM did is have their producer on-set to manage the project, but everything else is RAD through-and-through.
So the whole "we help out on stuff" thing is a muddy thing to use as a quantifier in the first place. It's like how films/TV shows have 'executive producers' that do nothing but allow their name to be attached to projects, or writers that only write one episode, and then someone else writes the rest of the season.