DY
I dont think so, and even he holds there are tzdadim lehakel. Keep in mind he is one of the OU’s poskim and would obviously leave if he felt he was certifying treif milk.
R’ Reisman on the other hand is more chamur in this sense as he really feels there is little room for heter in regard to chalav stam due to this concern. i have heard him on more than one occasion viewing it as triefus gamur due to the above mentioned concern.He has said to avoid keilim as well for this reason.
Although again R’ Belsky holds it is fine. I dont know the details of the metzeius.