Also, our own perception of time depends on this "block universe where nothing moves" changing and enabling some synapses and chemical reactions in our brains.

Also, our own perception of time depends on this "block universe where nothing moves" changing and enabling some synapses and chemical reactions in our brains. Hence, a change in this block could take an "eternity" (of real time, if there were such a thing) and we would only notice it as an infinitesimal moment.