I do not see any direct flights from FRA to BLR, DEL or BOM. In fact, not a single business class award seat is now available for BOM, DEL, or BLR for any day in Aug-Sept. Used to see for 3-4 seats every weekday (Tuesday to Friday) in Aug-Sept until last week. And, like clockwork, on the 179th day before, seats were being released until last week (at least on the FRA to India routes, except for MAA). Same was the case for some US routes, such as IAD, EWR, etc. (I am talking nonstop LH flights to and from FRA only.)

TATL flights being cheap in a fare sale does not explain the vanishing of direct flight seats to/from India from/to FRA.
(Just to check, I tried if business class flights from US to India were also cheap -- not so, unfortunately.)