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Aizen isn’t the shell, Aizen is the swirling goop within the shell. The Hogyoku was in the process of breaking him down to bring him to transcendence. Also it seems the shell’s durability is beneath Aizen’s capabilities as Yoruichi could crack it, yet when Aizen actually got serious he one shot her neg diff. Ig in that vein it could just be that he had intentionally lowered his stats like he does again later.It's weird because Aizen's shell was definitely "harmed" by Isshin's attack, and Aizen was definitely "harmed" when Gin shanked him with his Bankai - but the "limited" is in there so it might be fine.