Back in 2015 Microsoft wanted to get Bungie back. I think they are goign to buy them and split them into 3 teams.
Destiny 3 team
New IP team
Halo team to work with 343i.
It is interesting that those 3 statements by Shinobi (famed leaker at the time), Darren (Lasky voice actor), and Frank (Halo Franchise Manager) were posted within 72 hours of each other, with all 3 being deleted soon afterward, but I am doubtful that it is actually MS buying Bungie. Giventhe timing of those statements, it sounds to me like a small team at Bungie has secretly been assisting on Halo Infinite development since development began in 2015.