Microtubules the seat of Consciousness

No, it doesn’t.
Alzheimer’s is symptomatic of microtubule catastrophe, not the other way around.

This is actually demonstrated by my quoted science .

Anesthetics bind to tubulin, causing microtubules to destabilize** [84,85]. They can also cause microtubule-based molecular motors, such as kinesin, to reversibly fall off the micro- tubule lattice and thus disrupt transport of vesicles, proteins, and organelles to synapses [86].Nov 18, 2019

In this case, the introduction of anesthetics is causal to microtubule malfunction, which leads to disruption of regular data processing and/or loss of consciousness.