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wasn’t Patur Aval Assur’s chiddush.
It all depends on what the mkor/reason for eating on the 9th is. If you look in the mkor that PAA brought one of the tzdadim is that its not a real limud but rather an asmachta – therefore women would not be mechuyav. Look in the Moadim Uzmanim (chelek 1 siman 53) by Rav Shternbuch who lists numerous reasons for eating on the 9th and nafka minas which may apply to this chakira. additionally Shabbos has exceptions too – shalosh seudos and aish of havdala. If its an asmacta or if its a separate din its not included.