Even with a knight on the board, the wrong-coloured bishop and rook pawn cannot evict a king from the corner. The knight just needs to avoid being trapped where it gives White useful tempi.
A knight is not a liability when it has room. Black's king sits on h8, the corner the white bishop cannot control, and the knight on b1 is far enough away that it can never be caught. White's extra pawn and bishop do not change the fundamental fact of the previous drills: h8 is unreachable for the light-squared bishop.