This article seems to have some mistakes in its text, for one being the names of the terminuses of the new line - there is "Undok" in Hamhung, but this is far from the trolleybus network and is unlikely to have been the actual name. Most likely, it is referring to Hungdok. Haean is also unclear, but based on the text and other information in the article, it is likely the closed line to Ryongsong Station, paralleling the light railway.

Another error seems to be the "Chongnyon-ho" trolleybus, also mentioned in Trolleybus Magazine #246. This seems to be the article writer's mistake, as even in the attached photo it clearly shows that it is called "Sinhungho".

Despite the likely errors, there are still interesting pieces of information in the text: it mentions the upcoming possibility of closing the loop in "Haean" and Hungnam district, which explains the poles seen in this youtube video, filmed next to what would've been the most likely route of closing the loop.
https://www.youtube.com/watch?v=jksC2scJPMc&t=107s