Sure, that's fair. But my view is that humans are still primitive when it comes to technology. Consider that we are able to harness but a tiny fraction of a tiny fraction of a tiny fraction of the energies in our sun. Our understanding of the universe is still quite limited, even as we learn more and expand our knowledge -- and find applications for that knowledge -- as time goes on.
Assuming we as a species survive long enough, some time in the future we may consider reality simulation to be a fairly simple thing that we don't give much thought. Just like we take a lot of technology for granted today that people even a few hundred years ago would think is magic.
In the past couple decades we've gone from computers mostly being heavy boxes that sit under desks, to hand-held things we keep in our pockets. And a bunch of decades before that, computers were massive pieces of technology that required large rooms to contain them. My mother, who passed away in 2001, would be astonished to the point of disbelief to learn that, just ten years later, I had what she would consider Star Trek technology in my pocket.
And that's a decade or two. We likely can't even imagine today what humanity's relationship with technology will be 200 or even 100 years from now. Being able to simulate a universe at some point seems well within the realm of possibility, at least to me.
And remember, we don't need to simulate an entire universe. Sure, we see light from billions of light-years away. But the fidelity of things that far out -- hell, the fidelity of things not even all that far from Earth -- need not be simulated with any fine detail at all, in order to fool people such as ourselves.