Main users are people that make presentations and communicate data. It's not one specific role, as this could mean PMs, tech leads, BizOps, Data Scientists, etc. Specific workflows: weekly product updates, post mortems, ad hoc analyses, all-hands, board decks, revenue updates. Anything where understanding data is important.
Also, in your video description you linked the wrong startup homepage!
One thing that could be useful though is the ability to export a snapshot of what the slides would've been on any given day, for reference in the future (data might not be available in 2 years etc).
Good luck with your product. As someone who regularly worked with tools like R Studio or Jupyter notebooks, it boggles my mind to still see monthly and quarterly presentations that are the same, except for some (badly) copy-pasta'd data, so there is a need for this!