A lot of speaker manufacturers lie about their products, some for sensitivity, some for frequency response, some for impedance curve. Some expensive speaker manufacturers still use the cheap and unreliable electrolytic capacitors and inductors of doubtful quality in their passive crossovers. That is unacceptable at a certain price point.
If someone is preparing to spend many thousand bucks on loudspeakers, and doesn't want to be gypped, he should make sure that what he is purchasing has the right quality components before committing. IMO, electrolytic caps have no place in a passive crossover. Over time, their capacitance value changes to such extent that the original frequency filter point is entirely out of specs with overall altered frequency response.