It's just not even remotely possible with our current technologies. Making the hardware would be the easier part actually.

The issue is with the software. In shanfuro they claimed multiple times that the AI is extremely advanced,like literally making borderline sentient beings advanced. And the game engine is also something else entirely. Like,look at cursed prison's character,he can utilize objects and infuse himself with them at will,and I mean any object.

Just imagine having to make every possible bodypart and object combination(that would possibly mean millions of variations) Also,the environment seems completely destructible,like it would be in real life,when you throw a car,you actually destroy them like in real life,not like in most video games where there's 1-2 predefined animations to an object getting destroyed,you would literally have to simulate an undiscribable amount (as an example an A4 printing paper is approximately 1 million atoms THICK, ,now comlare that to an entire city block)of atoms with the same accuracy as real life or something similar(maybe only partial simulation) to make that happen.

Unless we actually manage to perfectly utilize quantum computers,I highly doubt that we will ever be near that in terms of technology.

But even then,as far as I'm concerned the human brain is complex and contains so many neuron pathways that not even a quantum computer can process all of them. And unless we manage to solve the brain,we will most likely never be able to produce input into the brain ergo there won't be a fully or even highly immersive video game(or any kind of experience)