Yatay: Rashi there is clearly pointing out that the Din is to ahve a special Seduah (although I think he appears to be slightly Soseir himself somewhere else). And Achilas Matzah (Rosh Hashana 28b at the very top, I believe) would seem to disprove you, but see the Rishonim and Poskim on that Gemara and Sugya and I would assume the Din is similar here.
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