Being "active" means that it's contributing something useful to the position. Being "bad" means that a bishop is locked behind its pawn structure; there are too many friendly pawns on the bishop's color. So, a bishop can be "bad," but "active" if it's contributing to the defense of the king, for instance, or is ready to pounce on the opposing king when the pawn structure is loosened in a few moves. On the other hand, you could have a bishop locked behind pawns that have no hope of moving and is not contributing anything; that bishop would be "bad" and "inactive."
I can't comment on the position specifically because I don't have the book with me, but I hope that helps.
In the Reassess your Chess Workbook, Silman says that "an active bishop can be either good or bad" (P16).
How can a bishop, which is active, be bad? (diagram 3 on P17 shows an active but bad bishop).
Anemone