ZD, no they’re not putting in pig’s milk on the farm. I am no nearly as confident that they don’t switch to non CY milk, though.
Chalav Stam is not trief like Pigs Milk
BTW I think on of the reasons regular Milk is ok, is because its not Chalav Akum, but rather Chalov Machine.
I dont think even in Chalav Yisroel does a jew milk the cow, Its probably the same machine in the same dairy farm (Likely a special run where someone just watches the process)