(S)he's making two points as I read it: 1. Much of what is being described as traditional marriage practice isn't actually traditional; the article notes that

(S)he's making two points as I read it: 1. Much of what is being described as traditional marriage practice isn't actually traditional; the article notes that what a modern person might consider Victorian marital values often weren't. 2. Much of what remains (as being actually traditional) is better off being destroyed.