>One of the main goals of the ArticlePlaceholder is getting more editors for the projects in question. We need to be very careful not to encourage them to create articles which are then deleted 5 minutes later. If this would happen to me as an editor I'd be extremely miffed because you just asked me to do exactly that 5 minutes earlier.

Sorry, I meant "not showing the create article button when the article is presumed not notable" ? If it should be very clear that when the button is shown, there is an incent to create the article, if the button is not shown it's very clear that we are just showing datas. There could be a button "edit Wikidata" instead.