As I understand it, this type of scrolling map visualization is something designed and implemented by Esri specifically for arcgis.com. See https://storymaps.ar

As I understand it, this type of scrolling map visualization is something designed and implemented by Esri specifically for arcgis.com. See https://storymaps.arcgis.com/en/ https://storymaps.arcgis.com/en/ for more examples and details. It may be that the author of this article on housing developed the analysis, maps, and text but not the actual web UI. That might be something provided by Esri that is common to all of these "story maps".