This help page explains whether the "Auto-Renewal Discount" will be applied if you joined the old Light Plan on February 1, 2024, and the auto-renewal is scheduled for February 1, 2025.
The calculation of the discount-eligible period begins from the time the payment for the eligible plan is made on or after 9:00 AM (JST) on September 9, 2024. Therefore, although the old Light Plan is an eligible plan for the discount, the discount will not be applied during the auto-renewal on February 1, 2025. The 10% discount will be applied after one year has passed, on February 1, 2026.
For more details about the "Auto-Renewal Discount," please refer to the following news page:
https://www.cryptact.com/en/news/auto-renewal-discount-en