It is diploblastic. This is the false statement about deuterostomes.
Protostomes and the Deuterostomes both are triploblastic and not diploblastic. Deuterostomes coelom forms through a process known as enterocoely, the mesoderm develops as pouches that are pinched off from the endoderm tissue. This pouches fuse to form the mesoderm, which gives rise to the coelom. Its early embryonic cleavage pattern is radial and gastrulation occurs during development. During development the deuterostomes's mouth develops from an opening into the embryonic gut other than the blastopore, and develops into the anus.
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