This only applies to JMB members registered outside Japan.
https://www.jal.co.jp/en/jalmile/jgc/enroll_world.html
Membership Renewal Qualifications
Notice: Starting from the membership renewal period for the 2021 service year, there will be changes to the qualification criteria for automatic membership renewal.
Your membership will be automatically renewed for the 2021 service year if you earn at least 35,000 FLY ON Points or fly on at least 14 qualifying JAL international flights that are eligible for JMB mileage accrual during the calendar year from January through December 2020.
As a JGC member, you can renew your membership by paying the renewal fee of 5,000 miles*, which will be automatically deducted from your JMB account at the beginning of March. This renewal fee will be waived for JGC members who earn at least 25,000 FLY ON Points or fly on at least 10 qualifying JAL international flights that are eligible for JMB mileage accrual during the calendar year. (Current requirements, applicable up to the membership renewal period for the 2020 service year).
In Japanese, FYI.
2021年度の資格の更新より、自動更新の基準が変わります。
2020年1月～12月の12カ月間にFLY ON ポイントを35,000ポイント以上またはJAL国際線にJMBマイル積算対象運賃で14回以上ご搭乗いた だいた方は自動更新となります。
毎年1月〜12月の12カ月間にFLY ON ポイントを25,000ポイント以上またはJAL国際線にJMBマイル積算対象運賃で10回以上ご搭乗いた だいた方は自動更新となります。
資格更新時に上記基準を達成されていない場合には、3月初旬にJMB積算マイル口座から自動的に5,000 マイルお引き落とし*のうえ、資格更新とさせていただきます。