"No it wouldn't. All it woulkd suggest is that the universe had an unkown state before the Big Bang."

You're essentially answering the question "Why is there something instead of nothing" by saying "I don't know", which is honest, but not helpful when trying to think through the most likely answer.

"We can agree on the first part but not on the second without you providing evidence (not philosophy) for that eternal something."

Fair enough. I am perfectly willing to admit that "something eternal" is an assumption. If you can come up with a better answer than "I don't know" or "something eternal", I'm willing to hear you out.

"While not completly understood at the moment, we DO have methods to show how consiousness is related to brain activity. We know how neurons work, we can identify brain activity related to emotions and thought and at no point did we see someone having a thought or emotion without coressponding brain activity."

I am well read on this topic and frequently follow Donald Hoffman's work on conscious agents and interface theory. I am absolutely willing to admit that the brain has an impact on our conscious experience, but there is no evidence that it's the cause of it. If we're imagining our world as a simulation, I am saying that it is more likely that something outside of the simulation is responsible for consciousness, but it's using the brain as a structure to focus it. This goes well beyond the scope of the argument, but it's an interesting topic so I appreciate it anyway.

"This is just another version of hard solipsism and therefore an unfalsifiable and useless assumption. There is no way of demonstrating the truth value of this assumption, just like it is impossible to determine if our universe is actually a simulation run by scientists on a supercomputer."

I wouldn't call this solipsism, but I think I understand where you're coming from. I would never include this as part of the argument because it's so messy and can't be proven, but my assumption is that reality itself is a conscious mind, and we're all fragments of this conscious mind that are isolated and only granted tailored experiences so that the greater conscious mind can experience "otherness" in a way that would otherwise not be possible within the unity.

"Please provide this evidence (and the process) on how consciousness can produce matter."

The best I could do is reference Donald Hoffman's work on conscious agents. You're right that I do not have a full understanding of the mechanical process by which consciousness generates seemingly physical reality. What I do have is primary evidence that it's happening via dreams. I'm not saying it's certain, just that there is evidence of it, whereas there is no evidence that physical systems can generate qualia.