Glutton's author just started updating the WN this January.
https://ncode.syosetu.com/n6887dt/
Quote:
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更新しました！ ここから、いつものダークへシフトしていきます！ 第五章はいろいろ起こります！
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https://twitter.com/isshiki_ichika
Author is also releasing a new LN for the end of January, Moto Eiyū wa, Joshikōsei to Isekai de Honobono to tabi kurasu/The Former Hero Lives a Warmhearted Life with a High School Girl in Another World.
https://bookwalker.jp/ded97937da-924...-5d677fdf3256/
It appears to be a rewritten version of a WN he wrote but never completed.
https://ncode.syosetu.com/n8656er/
Looks like we now know what he was doing during the hiatus.