Chofetz Chaim writes explicitly in Tiferes Adam that the custom is not to allow any type of utensil to cut to shorten the beard and that since that was the accepted minhag yisroel it has the force of a prohibition.
But the Chofetz Chaim is only followed when it fits with our lifestyle! Let’s find fault in others. It makes us feel better than examining ourselves.
Those guys don’t sleep in Amish and eat cake before davening!