For what purpose does a weightlifter take prohibited diuretics, if it is known that, according to the rules

For what purpose does a weightlifter take prohibited diuretics, if it is known that, according to the rules of the competition, the winner is the one who lifts the most weight with the least own body weight of the athlete?

Strong diuretics can drain 1.5-2 liters of fluid after a single dose. Thus, a weight lifter who takes a diuretic will lose weight before the competition, but retain muscle mass and strength. This will allow him to lift more weight. Since his own weight will be less, he will receive more prize points than an athlete with a higher weight. But this method is very dangerous. Diuretics remove not only fluid, but also beneficial electrolytes. Their loss leads to muscle cramps and, in severe cases, to irregular heartbeats.