Actually not quite right. I remember being on an island a while back where they would make milk/yoghurt based shakes.
fruit, yoghurt and a couple of handfuls of weed blended in, certainly had an effect.
In fact, I tried it again myself as a backpacker by simply crumbling up some weed by hand and mixing it into a pot of yoghurt bought from 7/11. Left the yoghurt pot for some minutes in a bath of crushed ice so that the yoghurt would soften the dry weed and then ate it together with my girlfriend ????
So unless the weed was ‘decarbed’ prior to purchase, there is most certainly an effect when eating it with a milk based product, even when cold.