I’m not sure we are discussing the same aspect of this mind experiment, and in particular the aspect of it that i find lovecraftian is that you may already be in the simulation right now. This makes the specific circumstances of our world, physics, and technology level irrelevant, as they would just be a solipsistic setup to test you on some aspect of your morality. The threat of eternal torture, on the other hand, would only apply to you if you were the real version of you, as that’s who the basilisk is actually dealing with. This works because you don’t know what of the two situations is your current one.

Wondering whether you are in a simulation or not is rather unproductive, as there's basically nothing we can do about it regardless of what the answer is. It's basically like wondering whether god exists or not. In the absence of clearly supernatural phenomena, the simpler explanation is that we are not in a simulation, as any universe which can produce the simulation is by definition at least as complex as the simulation. The definition I'm applying here is that the complexity of a string is its length or the length of the shortest program that produces it. Like, yes, we could be living in a simulation right now, and deities could also exist.

The song "Seele Mein" (engl: "My Soul" or "Soul is Mine") is a about a demon who follows a mortal from birth to death and then carries off the soul for eternal torture. Interestingly, the song is from the perspective of the demon, and they gloss over the life of the mortal, spending more than half of the song on describing the torture. Could such demons exist? Certainly, there's nothing that rules out their existence, but there's also nothing indicating that they exist. So they probably don't. And if you are being followed around by such a demon? Then you're screwed. Theoretically, every higher being that has been though off could exist. A supercomputer simulating our reality falls squarely into the category of higher being. Unless we observe things are clearly caused by such a being, wondering about their existence is pointless.

The idea behind Roko's Basilisk is as follows: Assume a good AGI. What does that mean? An AGI that follows human values. And since the idea originated on Less Wrong, this means utilitarianism. And it also means that we're dealing with a superintelligence, since on Less Wrong, it's generally assumed that we're going to see a singularity once true AGI is reached. Because the AGI will just upgrade itself until its superintelligent. Afterwards it will bring about paradise, and thus create great value. The idea is now that it might be prudent for the AGI to punish those who knew about it, but didn't do everything in their power to bring it to existence. Through acausal trade, the this would cause the AGI to come into existence sooner, as the people would work harder to bring it into existence for fear of torture. And what makes this idea a cognitohazard is that by just knowing about it, you make yourself a more likely target. In fact, people who don't know about it, or dismiss the idea are safe, and will find a land of plenty once the AGI takes over.

Of course, if the AGI is created in, let's say, 2045, then nothing the AGI can do will cause it to be created in 2044 instead.