That is not a true statement. the low current/ voltage if anything is why you want to keep them SHORT. Pickups / other/ more modern sensors use small current/ voltage and are susceptible to outside electromagnetic fields. There is a well known problem with such as MSD "triggering itself" AKA the power in the plug wires induces a trigger back into the pickup wiring.
You want to design the layout so the pickup wiring is short, and laid down near a ground plain. Twist the wiring if possible. Use shielded wire and or twisted pair similar to CAT-5. Ground only one end of the shield IE the module end, and insulate the other end, "Faraday shield."
Certain types of plug wires AKA the old solid core can increase power and magnetic field / radiation from plug wires. It's not just about "radio noise" It's about EMI/ RFI into other sensitive circuits
