Can wood-burning camp stoves really charge a phone?

Only the BioLite CampStove 2+ in this roundup has a thermoelectric generator and USB output. Community testing shared on r/CampingGear notes it produces more electricity than it consumes once the fire is well-established, but it won't fast-charge a phone, expect a trickle suitable for topping up a headlamp or keeping a phone alive in airplane mode.