I too doubt the ability of the target ship to see the wake unless the sea is very still/calm.
The orientation of the observer plays a large part.
Observers from aircraft overhead could see the wake as the angle was advantageous - Perpendicular and overhead
Observers from the submarine could see the wake through the periscope because their angle was advantageous - along axis
This does not mean that an observer from a target ship would also have an advantageous viewing angle.
That combined with the fact that the wake would be observed at the surface of the water about 70-100 yards behind the torpedo, would make spotting the torpedo wake in time fortuitous at best.
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