I think it’s a mistaken reference to https://www.sefaria.org/Mishnah_Ketubot.7.10 https://www.sefaria.org/Mishnah_Ketubot.7.10 which mentions trades like a tann

I think it’s a mistaken reference to https://www.sefaria.org/Mishnah_Ketubot.7.10 https://www.sefaria.org/Mishnah_Ketubot.7.10 which mentions trades like a tanner but doesn’t mention a dyer.