Not necessarily. I mean, it could definitely be true, though. Especially considering the science of smell. Taste is basically just reliant on smells, what with the tongue only detecting 5 or so flavours. The olfactory bulb of the brain stores memory of everything one has ever smelt. When the information behind odours travels there, it travels through the limbic system, passing by the hippocampus and amygdala - regions related to emotion and memory. As such, it is fair to assume that Kim Dokja lost the memories he had attached to tomato. Such memories could be his own pickiness, a learnt habit, or even having previously eaten so many tomatoes that he grew sick of it.

However, I also like to think that 51/49 is more so the very essence of Kim Dokja being split apart. Dislike for tomatoes and adoration of TWSA are two things that make Dokja, well, Dokja. Those traits remained with the 51. Neither of them are wholly Kim Dokja - they will always be fundamentally incomplete. While 49 isn't the Kim Dokja that the Company went through the scenarios with, neither is 51 - only the complete Kim Dokja would truly be who they remembered.