This is the premise I rejected immediately and, if you agree with me, it takes down the whole house of cards. Let me explain. The rationale has nothing to do with "quantum shenanigans."
I have been called religious but will readily concede that of course a physical brain is possible without a soul. What is impossible is to replicate a soul with purely physical matter. Therefore we may understand that "superintelligence" is possible, and maybe inevitable on the long thread of time, but - crucially - it will never be able to approach that supernatural element present in us (the spark of the godhead) and therefore never be able to replace humanity.
In that sense it is like any other natural disaster that threatens to make us extinct, but it is not some "superhuman" nor anything close.