Dephosphorylates CpsD. Involved in the regulation of capsular polysaccharide biosynthesis (By similarity). H2O + O-phospho-L-tyrosyl-[protein] = L-tyrosyl-[protein] + phosphate Capsule biogenesis; capsule polysaccharide biosynthesis. Belongs to the metallo-dependent hydrolases superfamily. CpsB/CapC family.