You’ve happened to come across some 2-year old FUD/internet drama — which is an eternity in comparison to the pace of development at Bitwarden. The iframe kerfuffle was never a serious security threat, but regardless, Bitwarden made some code changes to mitigate user panic incited by clickbait articles and other irresponsible commentators. Since March, 2023, Bitwarden users now get a warning as shown in the thread linked below: