I think he’s completely delusional here. The original Windows Mobile he’s talking about was never going to be a mainstream OS. It was going to be blown out of the water by the iPhone(Android survived by positioning itself as the licenseable alternative to the iPhone.)

All that took place a decade after the MS anti-trust case was a thing. By the time of the iPhone, MS had Steve Ballmer in charge for many years, and also had its head up its own ass trying to ship a version of Windows called “Longhorn”, which was a pointless effort to rewrite their OS in C#. They eventually abandoned this after several years and released Windows Vista, one of the least fondly remembered versions.

The old Windows Mobile that existed when Gates was involved was like Windows Desktop shrunk down a bit. It wasn’t remotely comparable to the version of Android that became successful. He’s rewriting history to give himself an active role in it.