Well, hypnosis is an alteration on the state of consciousness to facilitate sugestion, in Aizen's case the sugestions completely alter the target's perception of reality and we perceive reality through our senses (and in Bleach also reiatsu), so the consequence is control or manipulation of senses, though you could say he might manipulate the brain as processor of the stimulous from sensorial organs ( btw hypnosis itself help therapy for example to resignify memories, so he could do that too, he's too OP lol) 🤓☝️
For the reasons you mentioned is why I compared the MC to Shinji instead of Aizen, they are both much simpler manipulations of percepetion/senses, we pretty much agree on that 😁
But I'm not even sure if MC's skill is a manipulation on the target, might be something that alter himself because he fooled everyone, like camouflage/invis which displaces light, for a second there I even thought the skill was making him incorporeal not "displaced"