Consider two loudspeaker cables, A and B.
B is 5 feet longer than A.
The signal in B takes a bit longer to reach its loudspeaker because of this extra distance to travel.
The time to travel this extra 5 feet = distance(ft)/ signal speed(ft/sec) = 5/[(186,000(miles/sec) x 5280(ft/mile)] = 5.09 millionths of a millisecond.
You cannot hear this miniscule amount of phase-shift(delay or latency as some call it).
The Engineer's statement pertained to phase-shift so it thus stands.
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