I can remember how corn syrup was a NO, NO as bee food before 1980 or there abouts. Bees, at that time, did not respond to it at all favorably. Only slightly better than starvation itself. Most often, favorable weather, winter, would save them - not syrup! But, like everything else being forced on them, they had no choice but to adapt, to a certain degree, but syrup is still giving them trouble and what not.
(Although most will not agree with this. They might even produce some paper to bolster their claim to the plus side?)
But, as anything else, the bad was fast pushed in the dark corner when beeks discovered that it was much cheaper getting syrup, especialy if bought in truck-loads and no mixing and all that stuff, which further reduced labour, therefor cost... But, as of late the staff is simply found in honey jars all over the world and the issue has taken yet another turn...
As all else that pertains to bees, all is crafted to the mould that best fits beekeeper and not bees. I suppose they have no choice but to consume it, even though it most often does them more harm than good? Plain cane sugar is still the most suitable emergency feed... feed in a pinch as it were.
But, to feed them them milk? Well, it is sure a strange world out there in God know what else we are encounter? I for one get info of all sorts of weird stuf and concoctions that are feed to the bee in Europe, out of all places.