Though the how-to on the Japanese site and the pdf you pointed to does say 10C "use the fridge please", so it is inconsistent.
http://fujifilm.jp/personal/filmandc.../howto001.html

フィルムの保存温度は10℃以下に

■フィルムを長期保存する場合は、家庭用冷蔵庫をお使いください。

Perhaps I'll need to experiment with a pack.