I’d be more concerned of people not catching it in the water but outside the water. there’s alot of slippery concrete around pools, 2 yr olds do what 2 yr olds do, they wander of a bit, mingle with other 2 yr olds, fall, bleed, ect. A child that young with HIV doesn’t have the knowledge to protect others from themselves.
What's the kid going to do, give your kid an involuntary blood transfusion?
Even with tens of millions of people living with HIV, there has not been a single reported case of anyone contracting HIV from a restaurant, a swimming pool, or any other public facility. Catching HIV is a bit more difficult than I think you think it is.