What Dominick Dunn states is 100 percent correct that waxing the balls can make a difference in play. Whether the waxing player was cheating with malice aforethought is something different. Without knowing all the details firsthand, it might be an acceptable practice in Philippines to wax the balls to make the conditions better.
I've heard of players putting razor blades in the side rails at Johnston City to give a player an edge, and this is definitely cheating since the opponent does not know about it.
I've heard of rubbing magnesium on the rails to make them bounce differently as well as putting magnesium inside a pool glove.
At the Glass City Open one year, Keith McCready was up against Charlie Bryant, and he accused Charlie of coughing deliberately every time Keith was getting ready to shoot a crucial shot. I thought Keith was overreacting until I saw reference to an article written in Sports Illustrated by Robert Coughlin, April 4, 1955, edition: The Annoying Body Noise Shark: A well-timed coughing fit, burp, or loud sneeze during your opponent’s shot can put a player off their game.
Of course, there's a difference between cheating, sharking, and ignorance of the rules.