I read it as supporting my theory. It says that in French of the time as heard by English people at the time, the phonetic value of that u was ambiguously hear

I read it as supporting my theory. It says that in French of the time as heard by English people at the time, the phonetic value of that u was ambiguously heard as f or v. My position is v and u were phonetically ambiguous or sometimes heard as the same in Latin and romance languages. Maybe also in older forms of English.