Glad to hear you had an apricot survive the frosts!
Ichi Ki Kei Jiro is a straight Asian persimmon. Even if it is one of the most cold hardy Asian types, it still isn’t likely to survive our winters most years. I don’t think any Asian type is worth growing here without serious protection through winter(perhaps in warmer microclimates in the city, but I wouldn’t know as I live out in the country). Most of us are growing the straight American types or hybrid American/Asian varieties. I have Nikita’s Gift, Rosseyanka, and JT-02 for hybrid types and Yates, Prok, and Lehman’s Delight for American types. The American persimmons are plenty cold hardy for our region. For hybrids, it’s best to pick the ones that are more cold hardy, like JT-02. Nikita’s Gift is supposedly cold hardy down to -10F, which is still risky for our region. The coldest that we’ve seen in recent years at my location was -7 a few years ago and it survived that unprotected. I wouldn’t plant anything less cold hardy than that one. There are a bunch of more cold-hardy hybrid varieties to aim for nowadays.
Here’s a nice resource on the estimated cold-hardiness of persimmon varieties: Persimmon Cold Hardiness Resource
The issue I’ve been having with my persimmons is damage from late spring frosts rather than cold-hardiness through winter. Mostly on the trees that are quick to start pushing growth like Prok.
I don’t cover any of my persimmons. I covered Nikita’s Gift and Rosseyanka the first 2 years in ground while they were small, but not anymore. Best to grow the straight American types or hybrids that don’t need covered. Or grow Asian types in pots. I don’t cover any plants except for a crape myrtle. I, personally, really don’t like covering plants through winter. That involves too many issues that I don’t like dealing with (voles, susceptibility to late spring frosts, ambrosia beetle attacks due to late frost damage). I grow lots of fig trees, but all are in pots that I overwinter in the garage. I should consider growing pomegranates in pots, but haven’t looked into that much yet.