NEC electric code would require a GFCI breaker. I would check local codes which can be found at your local municipality or town halls.
Anytime water and electric are in an area together you need some sort of protection. A ounce of prevention is worth a pound of cure.
The pump itself technically does not need a GFCI, but since you are dealing with water, pool and people it would be wise to. And location of the pump should be considered. The hose on the pump can break or leak. Water can be splashed and cause a issue. Who knows it could be installed incorrectly or wires be exposed to elements and have to potential to hurt/kill someone.
Now if something tragic were to happen, god forbid, YOU the owner is responsible as well as the installer. The price of a GFCI breaker is nothing compared to someones life.
Another is if it is hardwired he is supposed to use WATERPROOF material/parts. Such as waterproof wire nuts and fittings, box and cover. This is dictated in the NEC, codes. It is not a may, or should. It is a MUST USE.