Hard to place the blame on a single person, though I do think a "management consultant wearing an engineer costume" captures Google's engineering leadership these days
Yeah. But what do you expect when the boss comes from McKinsey? Not only does the place teach a particular skillset, it also selects for very peculiar employees. It would be downright weird if an ex-McKinsey employee were anything like a decent engineer.
McKinsey has absolutely stellar engineers and engineering leadership in its internal software teams, it's a gift and joy to work with them. Not sure about the consulting side though.