That speculation is based on a single job posting. Required experience is given as "digital audio workstations, virtual instruments, game audio soundscapes, or other examples of audio in software", and the job entails "building a software platform that enables new music entertainment scenarios". Which sounds pretty generic, and not DAW-specific.
Microsoft employs a
lot of people - 120,000 last time I checked. That's more than there are people in the city I live in. Did you know that MS has a beautiful state-of-the-art recording studio in Redmond? There are people drawing a healthy paycheck with full benefits to work there. Of course, they're not recording the Rolling Stones in there. Mostly voice-overs, sfx and music for video games. But still, it's got to be a sweet gig.