He says the mice survived. So that’s nice, I guess. I still doubt it a bit, since mice can die of stress if you just leave them a little too long in an ordinary non-oily live trap. I highly doubt they would really survive this in the long run if you don’t want to keep them a s pets in a secure enclosure.
Otoh if you want to release the in the park it would be nice to add a little salt & pepper to the oil, so the mice are seasoned nicely for whichever predator will catch them sitting catatonically in the grass