If it is abandoned, it should be only `abandoned:leisure=swimming_pool` and not `leisure=swimming_pool`. The latter implies that it is not abandoned and in use. Both tags cannot be used at the same time.

Alternatively (and possibly applicable here), one can use `leisure=swimming_pool` + `abandoned=yes` to signify it is still very much a swimming pool, just in disrepair.

I am not sure which applies here, it would depend on its actual state and whether it is preferable to have it appear for various data processors and maps.