Nvidia probably collaborated on the Epic demo but also they are aimed at two entirely different sets of customers. Nvidia's news cycle is data center updates in May, consumers/gamer updates in September.
Epic demo was running on PS5 so no NVIDIA involvement there.
Oh yes, I forgot they've entirely lost this console generation.
Well not entirely (and depending on what you count as this console generation): the Nintendo Switch is based on an NVidia SOC. Although that's probably not the biggest money maker.
And the entire HPC exa-flop super computers as well.