This page is in the SMW news feed
This page already existed; it was just a correction within the page which has been done. Nothing new. I have checked that the page has no category assigned, and I have set category = Result formats. Does it help ?
No, it's because this page has values for Property:News date (which it shouldn't, because it's not a news item), and so is being picked up by this feed: https://www.semantic-mediawiki.org/wiki/Special:Ask/-5B-5BNews-20date::%2B-5D-5D-20-5B-5Blanguage-20code::en-5D-5D/format%3Dfeed/sort%3Dnews-20date/order%3Ddesc/searchlabel%3DAtom/type%3Datom/title%3DSemantic-20MediaWiki-20%E2%80%93-20news/description%3DLatest-20news-20from-20semantic-2Dmediawiki.org/page%3Dfull/offset%3D0
(This was also sort of raised above but with no resolution.)
I guess the reply (2) template could be changed to not transclude property definitions when in the Help namespace. Or something. :-) I'm not sure.
Wow, it is interesting to see where the news items from Semantic MediaWiki are propagated. There was an issue for this two years ago:  with  as resolution served starting with SMW 2.4.0. So if I understand correctly from the example given  the parameter "embedonly" has been extended not prevent annotations via embedding the result on a page. So what irritates me is that we are still seeing the annotation even after I added the parameter to the query. This one works on sandbox. :|
There is also another issue. The translation source as well as the clean clone of the translation source are fed into the feed. This should not happen for the latter. Here on this wiki I added another helper property "Is duplicate page" to be able to distinguish between the two. I guess I will for legacy reasons have to add some magic to the news template to prevent the "News date" property from being used. I will have a look.