He's still sorta right. Typically, in the past, there has always been kind of a strata, with the exception of the Chairman role, which was oddly used as a semi-temporary training ground for non-parks people (see: Jay Rasulo, Tom Staggs, Bob Chapek, etc), "parks people" were to stay in Parksland and were rarely moved over to the corporate or creative side of the company.
Josh is the first person to truly come up almost exclusively through WDP&R and make it to the Chairman level since Dick Nunis in the 90s. Also the first to take over larger corporate responsibilities (consumer products), in the history of the role.