Pashut pshat is definitely how R’ Henkin explained it, and in fact that’s how R’ Chaim Kanievski explains it in the Shoneh Halachos which you linked. But even if you somehow say that the Chazon Ish was referring to the Mishnah Berurah even individually, then nolens volens he is also referring to the Beit Yosef and the Magen Avraham individually. Aside from the impossibility of this (since the Magen Avraham often disagrees with the Beit Yosef, and the Mishnah Berurah often disagrees with the Magen Avraham and often disagrees with the Beit Yosef), it would come out then that every ruling of the Beit Yosef is like a Sanhedrin, yet Ashkenazim rarely follow him when he is opposed by the Rema and/or the great Ashkenazi Acharonim.
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