Unrelated but I noticed Shoseki's weekly cut-off estimate has been declining even further. This week's rank 500 estimate is only 800 copies.
First week of June cut-offs going back to 2020: 900 (2025), 1250 (2024), 1450 (2023), 1600 (2022), 1750 (2021), 2450 (2020)