Super Smash Bros. Ultimate gets the free Monster Hunter Stories 2 Spirit if you save your data

Nintendo will release this morning on July 9th Monster Hunter Stories 2: Playing the Wings of Doom Super Smash Bros. Ultimate owners get the spirit of the free Monster Hunter Stories 2: Wings of Doom in-game Clarified that it can be done. When I read the comments on social media, it seems that I need to save the data from the entire game instead of saving the data from the demo currently published on Switch eShop. Hopefully confirmation about this will come soon from either Capcom or Nintendo.