That‘s not what he meant. He wasn‘t talking about potential customer markets that competitors might have missed - he talks about a product gap in the field of advanced supersonic trainer jet + LCA/light fighter design which is obviously false.It is you who missing the point, there is a big market that KAI have not been able to capture which may be addressed by TAI.
"HÜRJET will truly fill a significant gap in its field. Its design as both a supersonic aircraft and a light attack and training aircraft allows for a wide range of configurations and uses."