Why few interest in C-2 export if its costs is cheaper than the A-400M?

According to our local weeaboo donchanchan,
Japan rolled out the first mass production version of the C-2, which has little fanfare for the 1960’s era engined Y-20
costs is roughly 180 million USD

making it cheaper than the C-17 and Airbut A-400M
its payload capacity is less than the C-17, but slightly higher than the A400M