No, it has not fallen flat. Something being common knowledge, and yet still held to be irrelevant was exactly my point. You are free to peruse information about Louis Auguste if you'd like
https://en.wikipedia.org/wiki/Princess_Louise_Auguste_of_Den...
> Though officially regarded as the daughter of King Christian VII, it is widely accepted that her biological father was Johann Friedrich Struensee, the king’s royal physician and de facto regent of the country at the time of her birth.[1] She was referred to sometimes as "la petite Struensee"; this did not, however, have any effect on her position.[2]