They're not saying it's of no relation. They're saying something like, "once the language became English, the b was never heard". This isn't a circular argumen

They're not saying it's of no relation. They're saying something like, "once the language became English, the b was never heard". This isn't a circular argument or glossing over "what does it mean to be English", because while the line is blurry between Old French and Old English following the Norman invasion of Britain, there's no such link between English and Latin.