You're reading a press-release for 9.1 - He's not talking about it from the developer's perspective. He's talking about it from the player's prospective. Do you think Ion was going to start talking about the Jailer & the Arbiter in the press-release for Nazjatar? Do you think the writing, voice acting, & gimmicks for a patch just magically manifests the day it hits the PTR?
Considering they've been trying really hard to distance those lore heroes from player classes? Yeah. At least with these current developers. Anduin is a "priest" who fights with a sword & plate armor. Tyrande is a "priest" who has animal companions and a glave. Sylvanas is a "hunter" with void form. That tells me they consciously avoid wanting players to feel like their major plot characters.