The last time I ate there was a couple of months ago. Unfortunately at that time, they did not have the fried sushi option. According the site, they look to be serving the same sushi that can be ordered in Kona Cafe. Current link : https://disneyworld.disney.go.com/dining/polynesian-resort/kona-island/menus/dinner/
I also want to point out that Splitsville in Disney Springs has excellent sushi options. They are reasonably priced & they have a fried sushi option.
I hope this helps. Have a magical day.
