Reminds me a lot of Notion.so (https://www.notion.so) which got me to move away from OneNote for the first time for about a year, but the lack of pen support forced me to switch back.

Having all the data in the "document" stored in a database of sorts and then being able to pivot the display and reference and pull in across different surfaces was a very useful in practice. From the copy and mockups also might be fair to view this as a mashup of AirTable + Access + OneNote.