I think you maybe misunderstood the parent comment, I don't they were saying that AWS figured out scaling their physical infra so therefore Blizzard could figure out scaling their physical infra.

I think they were saying that tools like AWS -- which provide access to near infinitely scalable infra on demand -- are now commonplace which make scaling greenfield projects much easier than it was 20 years ago.

I don't know about blizzard but a lot of game providers do run on hyperscalers nowadays so I understand what they're getting at.