It's easy to speculate, but it's not easy to find any evidence at all to back up those guesses. It's still not clear that this has anything to do with consciousness or information processing or AWS datacenters.
So one thing is certain - the brain does use quantum mechanics just like the rest of the body, because otherwise it wouldn't be possible to have so much done inside such a small volume, with such small amounts of energy.
Of course this question is actually meant to be "is brain a quantum computer?" and we don't have any idea.
That's interesting. Could you share your source?
The Wikipedia page is a good start, it has some relevant references to research articles in the Enzyme catalysis and Energy transfer sections: https://en.m.wikipedia.org/wiki/Quantum_biology
Quantum effects are also used inside cells to convert chemical energy to motion. It wouldn't be possible otherwise at that nanoscale.