From what I read this variety of banana have thinner skin with less fiber (and no astringency) as well as use no pesticide in cultivation and thus more viable to eat with skin
As for the flash freezing part, it is said that they cut part of the seedling, put it into a special liquid and cool it to negative 60 degree Celsius. They claims the main purpose of doing so is to "awaken" the "ancient memory" from dormant genes of banana when they went through the ice age in order to allow bananas to be grown on Japan mainland which is usually too cold for banana to be growth.
So it does not actually involve "seed".
Edit: It seems like one of the main factor why the farm is able to grow Gros Michel and not adopting pesticide is that there were no banana being growth in Japan and thus there are no pests nor pathogen against banana. Not sure if they can keep the advantage for long. They claims the fungus that cause the new panama disease cannot grow in Japan due to the climate.