I think Cathedral is closer to death metal structure in my personal view compared to classic Black Sabbath, so that should not be too surprising. My test is simple, the history of thrash itself shows a lot of it coming from combining hardcore punk influence directly to metal, a lot of old thrash feels to me having mild to overt hardcore sections or riffs at points. And I think that's the aspect that gives thrash its political themes and more direct lyrics compared to the more fantasy or generic bragging style of older metal.