While it's nice to get out of Keiichi's head, I couldn't help but feel that this was a "bonus story" like how El Camino is a bonus story for Breaking Bad: it kinda doesn't feel that important, but it contributes to the worldbuilding. I am not sure why this is slotted here in ch 4, other than that it doesn't reveal anything past here. Even its revelations seem implied by the previous chapters, anyway ...