Kobo has tweeted that the Kobo Papier fragrance they announced on April 1st, is actooly a real thing!
https://twitter.com/kobo/status/1379448907307044867
I think this might be preliminary marketing for the new device we're all expecting. If the device is called the Papier, then to me this implies that it will also double as a note-taking device and may have a larger form-factor than expected.
Personally, I'm hoping that it has the Papier scent with a lifetime guarantee of lovely paper smelliness like the Toy Story Lots-o'-Huggin' Bear plushy.