It's a bullcrap article:
1) There is at no point in the article where AMD says they are limited to 4GB of VRAM with HBM
2) In the slide itself it doesn't say anything about being limited to 4GB of HBM.
3) The article they link using that as an example for their reasoning claiming it will be limited to 4GB contains information that has been presented by Hynix multiple times already. They even use a phone call with the CTO who says outright, "You're not limited in this...