They still hard target the Medic, despite being in the cloud. It seems that it only affects player Monsters. No use in using it if a Monster player drops.
The Monster A.I. needs to be affected by this.
How am I so sure? You need to have a reticule to pounce a Hunter. The large spore cloud radius means that they shouldn’t be able to pounce you while they are in it, as it should remove the targeting reticule (I’ve tested this as a player Monster.) But they repeatedly have pounced me.