If the snake is a Colombian it is not the largest species of boa constrictor. Colombians can get big, but not as big as the BCO and BCC boas.
If he said it was a common Colombian boa "with" BCC then perhaps this snake is a cross and therefore not pure.
BCC is not a Colombian = Colombians are not BCCs.
BCC boas would be Peruvians, Surinames, Guyanas, etc (some examples)
BCI boas would be Colombians, Central Americans, Hog Islands, Mexican dwarf boas, and other island boas (some examples)