When a user uses the Revision Slider for the first time, they see a dialog with some help about this feature.
The purpose of this tutorial is to explain about the Revision Slider "in a nutshell", without extra unneeded information.
Therefore, I think the following sentence should be removed from MediaWiki:Revisionslider-help-dialog-slide1 :
It is based on a community wish from the German-speaking community technical wishlist.
I don't find this information useful for the tutorial. It is not relevant for the user, who wants to get help about how to use the Revision Slider.
Information like this can be included in the RevisionSlider help page on MediaWiki.org, but it is redundant to include it in the help dialog that every user sees when using the feature.