I've figured it out...
Musk and others claim that it's all a huge computer simulation. Everything.
But modern compilers are optimized, so a clever compiler (i.e. God's) wouldn't bother calculating a result if it doesn't matter. Therefore, "If a tree falls in the forest..." etc. = silent. (Finally got that answered.)
But the same thing explains quantum physics. There's no need to compute if Schrödinger's Cat is dead or alive unless somebody can be bothered to look.