He seems to be playing the typical corporate lackey role. His comments are all full of condescension, platitudes, and corpspeak. He sounds more like a PR person than a principled leader. He's saying exactly what he thinks his audience wants to hear. It's not surprising that he thrived as a Microsoft exec.
That he's willing to make promises about GitHub's future is also telling. He's the "CEO" of a company owned by another company. He can be fired and replaced at the first hint of disagreement with Microsoft execs. He can't afford to rock the boat at all and he knows it. So he's being dishonest or naive when he makes these promises. A more honest or aware person would make this distinction clear.
Microsoft ruining GitHub over the next few years will be a good thing for open source. There was never anything ideal about relying on a highly centralized proprietary service. GitHub made it work but Microsoft will reveal the inherent weakness of this situation.