I think this demonstrates a conditioned response that Mormons have to anything which seems to denigrate the faith. Their immediate reaction is to dismiss it as a lie. In this case, that instinct doesn’t serve them well because the seer stone story is a well attested fact.

Many computers are silicon based.

Humans need a form of interface with computers (ie: keyboard, monitor, microphone, etc.)

According to myth, in the last days the earth shall be burned and become as glass. What’s glass made of?

According to Mormon myth, those remaining inhabitants will each have an Urum & Thumum (seer stones).

Generic conclusion: The earth will be a giant super computer and the seer stones will be our interface with it.

Like I said, thrown together. Debate me if you want later, but I can believe in the almighty computer.

Now back to my popcorn.

I would hope that the Great Celestial Supercomputer would at least have gotten away from our crude silicon based computing. SiO₂ makes me think perhaps it would be an optical computer with a wireless connection to the white stone.