A genetically modified human was very different from a mutant. For mutants, they were born with a genetic mutation. They were a kind of entity between human and beast. It was not necessary for them to wield any True Kang to use their Special Ability.
As for genetically modified humans, they were born human. However, through technology, they modified their bodies to be able to do something that other human could not do. Ultimately, they had to rely on a serum to activate their Special Ability.
That was why Chen Xiaobei's Netherspirit Battlescouter could only see the original strength of the Genetic Modified Human but not the strength that he had after injecting himself with serum. Due to this mistake in intel, Huo Yuanba and the rest of the people were left in a desperate situation.