My guess is that this was a render for the RTX 6000 Blackwell workstaton GPU and they didn't change the memory chip labeling. Its a very easy mistake to make.
I just don't see why Nvidia would replace the RTX 5090 when it would only serve to devalue existing RTX 5090 GPUs and their RTX 6000 Blackwell Pro GPUs. It's not like they need to worry about AMD or Intel ATM.