The question was about English. (Is there an English word that starts with Y and means the thing in this picture?") The answer did the almost impossible job of proving a negative. "There is no English word that starts with Y and describes the thing in this picture." the answer then went on to explain how a Swedish word crept in. If any future user can write a question which will lead to a comparable level of detective work about English, have at it! If any future user can come up with an English word that answers that question, I want to hear it.
Mari-Lou presented even more cogent reasons why the question is about English.
Moreover, with 1.5 billion or so people speaking some form of English, the large majority of which are non-native speakers, perhaps we should expand our territory from English usage to English misusage. To some extent, we already do, with tags for different varities of English, although I am not suggesting that a dialect is a misuse of English.
@Draakhond brilliantly summarized how English might have been misused in this case.
I don't want to debate the disposition of the YAQ -- Mari-Lou has done that -- only to suggest that our boundaries should not be so inelastic that serious, well framed questions that elicit brilliant answers can be easily dismissed as off topic.