The Mishna Berurah consistently quotes rulings of the Shulchan Aruch Harav. He was gerechunt/considered from the Gedolei Ha’Achroinim. However, the M”B changed his name to the Shulchan Aruch HaGra”Z, not as he was known Harav.
I would ask the moderator to close this thread. We should be afraid, especially days before R”H of the horrible insults of a talmid chacham & a manhig in Klal Yisra’el. Delete those comments or the entire thread too. Thank you