I'd have to know more about it. Did he have any reason for moving to windows? If there was a sound business case then I wouldn't call it impulsive. Even if it was impulsive, I don't think it falls into the same category as what we see from him today.
My opinion is that he had no GOOD reason. He just knew the Windows dev stack and has a giant ego. But, I'm probably biased since he reminds me of managers/PMs I've worked with in my career that have weak opinions strongly held which affect me.
I think it's similar to how he has banned use of Kanban or other Toyota Production System principles at Tesla (which is the easy explanation for their poor build quality, see: U.S. car manufacturing 1970's).
Oh yeah totally ironic. The factory where Toyota taught GM how to make cars reliably has completely regressed to a mess of scrap and tents. They even got rid of the railroad siding which seems crazy to me for a pro-environment company.
