Adding the fact that Georgian contraception was as reliable as the rhythm method and chaperones kept single women tightly superintended, any opportunity for Austen to have sex would have been as undesirable as it was unlikely.
Yes, it was frowned on by society.
We simply do not know.
Worsley acknowledges this in her book.
You only have to read Austen novels to know this.
But none of that means Tandon believes Austen was projecting Sapphic urges.