As with much of what is out there, it's a mix of some truth and some falsehood. Traditional chlorine (i.e. from chemicals) will oxidize the inorganic chloramines that it forms so they are not permanent. Some organic chloramines are slower to oxidize, but the UV in sunlight breaks down chlorine into powerful hydroxyl radicals that help oxidize the organic chloramines. So normally there isn't any problem in an outdoor residential pool with regard to chloramines. It is true that a saltwater chlorine generator superchlorinates a portion of the water with high chlorine levels at low pH so that will tend to oxidize additional chemicals, but this isn't much of a benefit in outdoor pools though can be helpful in indoor pools with no sunlight exposure.
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