Is this puzzle fair, legit or wrong ?

The Queen is pinned in the g1-a7 diagonal by the black bishop on d4 thus Qxf8 is not a legal move

The queen is pinned by the bishop

Thank you.
l.e. misclicked
lichess.org/training/QU2hq

Qxf8 is illegal because of the Bd4 could take the king.
Edit:
Too slow :(