I tried your teory but when I killed the wisp on my hunt analyser appears the quantity I killed (4).:
Session data: From 2020-10-29, 20:23:48 to 2020-10-29, 20:31:34
Session: 00:07h
XP Gain: 7
XP/h: 43
Loot: 70
Supplies: 753
Balance: -683
Damage: 558
Damage/h: 558
Healing: 2,106
Healing/h: 2,106
Killed Monsters:
1x badger
5x silver rabbit
4x wisp
Looted items:
2x silky fur