Is it really? The text above mixes stuff quite some.
The input is a modern opamp (which are usually FET-based) with very high input impedance. They do not load the source. In a signal line the source has to be lower impedance than the input, or the input will load the source. These opamps have so high input impedance, that they are practically invisible to any modern coil-magnet pickup, hi-Z or lo-Z. Even piezos. "Matching" is used in a funny way here.
Bassist @Woodinblack
uses lo-Z output to reduce noise and to ignore the load of the cable. High input impedance has nothing to do with that. Only if the input Z would be in close range with the source, there would be reduction of the frequency response. A modern opamp has an input impedance in the GOhm range. Your source, i.e. bass output impedance is probably ten to hundreds of kilos. Come on fellow players, this is basic electronics.
Easy test of this is to bypass all hi-Z bass adjustments. This means those cheapo carbon track pots. What happens? Well, there will be more treble, as the pots load the pickups. Easy as that. Lo-Z electronics tackle this issue by using the pots only to affect amplification. The pots do not have to be in the direct signal route. Check John East's creations.