Very interesting, I assume it's probably to do with developing immune system. We use UHT (Ultra high temperature) milk as our standby milk, we're not big milk drinkers so there is not point keeping fresh milk in the fridge. It's really the equivalent here of powdered milk, (which is also in the same >100C processing group)
It's interesting that in the results they say that
Consumption of all cow's milk products [1.09 (1.03, 1.15), p = .003], nonfermented milk products [1.08 (1.02, 1.14), p = .008], infant formulas [1.23 (1.13, 1.34), p < .001], and strongly heat-treated milk products [1.08 (1.02, 1.15), p = .006] was associated with nonatopic asthma risk
They didn't look at raw milk so that cannot be added in.
Here in Denmark you can legally buy raw milk from anybody who has a cow, in reality it's hard to find.