The discussion also mentions exceptionally grave prohibited utterances under coercion, including being forced to speak disrespectfully of the Prophet ﷺ. This is a hypothetical legal case, not approval of such speech in normal circumstances.
Its analytical place is the first kind of rukhsah: grave coercion can produce a limited legal concession without erasing the underlying prohibition.
The phrase مع بقاء الحرمة is essential. The point is to maintain the distinction between an excused occurrence and an act being generally permissible.