Ir should be in both routes. However I only did this part in the incest path. Will check it in the neighbor path later today...
Added:
I just confirmed that the peephole is indeed not working in the neighbor (normal) path. Jux Apo is gone inside, there is a note on the door, but clicking it doesn't do anything. This works in the mom (incest) path. I reported this in the correct channel on Discord.
Added 2:
The developer says this bug will be solved in the next version. It is just a small animation which can be viewed by playing the mom (incest) path. It is independent from the main adventure so you can load that savegame and only do the Jux Apo part of
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