Yeah, you are right, my mistake. I didn't even check the article, just the title, and I made a guess based on it...probably because of Akira's explanation too (page 23)
"This phone is capable to record 4K video..." or something like that
the title of this article says ヨンケー and フォーケー are the other names of 4K in Japan
also, in the first paragraph, it says, "In Japan, it is also known as 'yonkee'..."
and if we're talking about the word "one" in Japan, it becomes "wan",
here's an example "wanman" (ワンマン)
https://en.wiktionary.org/wiki/ワンマン