I think a big aspects is that persimmons are hobby farm fruits or processed fruit products at best for their profit margin. fresh fruit market has the crunchy kaki for supermarkets. so the likelihood of them making profit form the research is low. The chance for making a lot of home orchardists etc very happy is high though 
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Anyhow I agree it is a worthy task for people and institutes alike.
I don’t think we should give too much weight to the min temp claim on that website, I checked other virginiana pages and they also claimed -35c.
here they say Sophie’s gift is hardy to -30c (-22f) which i think is clearly inaccurate.
https://www.esfloraonline.com/urun/dar-sofiyivky-hybrid-persimmon-diospyros-x-dar-sofiyivky