Spot on. Seems they're working on some outdated research, but I suppose that's understandable with the rate at which things develop in cryptoland. GPUs are definitely still in use for some altcoins, but it's difficult to tell exactly what effect it might be having because there's a lot we don't know. How many people are going out to buy GPUs just for that specific purpose? In what quantity?
Many more coins are in use which have mostly GPU mining as well. While Bitcoin is huge with all the ASICs, there's a lot of money going into mining alts.
While there might be more to it, AMD and NVIDIA will be producing certain amounts of GPUs and expecting most of them to be used in the gaming niche, so when a whole new niche jumps on the scene with an incentive to just buy shitloads of their graphics cards, you can see the link there.