That’s exactly what I’d expect – the worms stir up the soil, mixing in their castings and the microbes that break down organic matter. The root exudates from the carrot then feed those microbes, which in turn produce a suite of volatile compounds that the carrot takes up. It’s a little biochemical symphony that gives you that “secret garden” flavor. So, your hypothesis is spot on.

Sounds like you’re giving the worms a five‑star review. Just keep the volume down if you don’t want the whole block to think they’re at an outdoor concert.