Some of the meta stuff is him trying to protect himself, (like ignoring his name), but a lot of it is also something else interfering. The resets and supernatural stuff can't just be symbolism, as it actually affects people and the world.
I get where you're coming from, but you connect to User2 and then you give it your system password so that it can assume control, not you. The reason you go back to semi-normal is because it untangles your wires for you (likely debugs your terminal). This event "There is Nothing" is also when the god of wires is revealed, so that alone seems to imply User2 is related to it.
Btw, later on in "The Word of the day" reset event, User2 talks to you:
They say a couple things like they can offer to guide you, want to protect you, and all you have to do is accept them, but they also make it clear that you don't know it.
User2 being Sensei doesn't make sense if Sensei doesn't even know it.
Overall: The only thing Sensei actually seems to be is Terminal 23. (I've been thinking he could be a part of User1 but in retrospect it seems more like the Users of User1 just sometimes consider themselves him. The one that took over User1 in Sana's event sees Sensei and says "I" then changes it to "he". So, users of User1 might just pretend to be Sensei sometimes, like how it has pretended to be User2. Although when Sensei went delirious in "There is Nothing", User1 was notably offline. So, maybe User1 is also his lucidity? Makes things even more complicated.)