There is an argument for consciousness requiring biological processes, that being that the only examples of consciousness we've encountered involve biological processes and we have no evidence or reason to believe it's not a hard a requirement. Like, non carbon based life could exist even though it's very unlikely but we have no reason to seriously consider it because there's no evidence of it. Similarly y'all are just wildly speculating without any evidence or impetus to cause the speculation. LLMs do not exhibit any intelligent behaviors. They don't exhibit behaviors at all. They generate output based on input. They're no more capable for consciousness than a calculator. As for the last point of yours we are in no way remotely capable of approximating a brain in either software or hardware, like not even close. Quantum computers might not be able to manage that.