Ac tally, this capacity number means more than 20% of NK oil consumption.Even if you have syngas production that is not enough to make synthetic fuels like diesel. It can be used to replace methane in a lot of industrial processes however.
The world's largest manufacturer of synthetic fuels right now is probably Qatar and I think their factory uses technology by Sasol from South Africa. AFAIK China also has some expertise in the area but it is a lot more limited.
The syngas contain 50% of NG energy content by wiki, so it means 20 000 cubic meter natural gas equivalent.
That is in the range of 2-3000 barrel / day.
An NK has a coal gassification plant in this size range already, next to Anju.
That makes ammonium nitrate . What other industrial process ( apart from synthetic fuel ) require this much syngas?
There is an abandoned synthetic fuel plant in Undok . Maybe they decided to get around the sanctions.