It’s not carb but persimmons can cause much worse medical problems if you eat too many and eat inappropriately, especially with a lot of proteins. If I remember correctly, you mentioned you had some digestive issues before, then you need to be very cautious.
See this link Carbonated soda treatment of phytobezoars - Wikipedia
I had been eating all kinds of persimmons when I grew up in China, but the adults always restricted how much pieces a kid could eat - it’s a known issue since ancient times.
By the way, a mature Asian tree can produce around 200 - 400 lbs, that’s way more than a family can consume in a year.