Microtubules have been pushed for decades without any proof. The latest paper wasn’t evidence but unsupported speculation.
But more importantly the physics of computation that creates intelligence has absolutely nothing to do with understanding intelligence. Even if quantum effects are relevant ( which is extremely unlikely given the warm and moving environment inside the brain), it doesn’t answer anything about how humans are intelligent.
Penrose used Quantum Mechanics as a “God in the Gaps” explanation. That worked 40 years ago but today we have working quantum computers but no human intelligence.