Given statement is true. This is because the substance may exist as colloid under certain conditions and as a crystalloid under certain other conditions.
E.g: NaCl in water behaves as a crystalloid while in benzene, behaves as a colloid (called associated colloid). It is the size of the particles which matters i.e. the state in which the substance exist. If the size of the lies in the range 1 nm to 1000 nm it is in the colloid state.
