Haumea is uniquely ellipsoidal among dwarf planets due to its rapid rotation and it has two moons, Hi'iaka and Namaka, which makes the statement true.
The statement that Haumea is the only dwarf planet that isn't spherical and has an ellipsoidal shape is true. Unlike other dwarf planets which are mostly spherical due to hydrostatic equilibrium, Haumea's rapid rotation has led to its unique shape. Additionally, Haumea indeed has two moons: Hi'iaka and Namaka.
Dwarf planets are celestial bodies that, among other criteria, have sufficient mass to achieve hydrostatic equilibrium but have not cleared their neighboring region of other objects. Haumea is one of the five recognized dwarf planets and resides in the Kuiper belt, a region beyond Neptune filled with many such small icy bodies.
In conclusion, the claim that Haumea has an ellipsoidal shape and two moons named Hi'iaka and Namaka is true.