although he did add that people standing in the pool presents a
point load that needs to be considered as well.

Does it? 100kg of person displaces 100kg of water - i.e. the water
level rises fractionally across the whole pool leaving the loading
under the person more or less unchanged. Or so ISTM

There's a point load if you stand on the bottom. It is the mass of the
person minus the amount they happen to be displacing. This is approximately
equivalent to the mass of the body parts above the water level (and exactly
so if the human density==1). However, with a 1.5m level, this difference
(and hence point load) is likely to be small.

When swimming, they will displace their entire mass, leaving no point load.

In any case, the additional weight is peanuts.

Christian.