One of the features discussed in the keynote for this new app's announcement is that they are adding iCloud syncing as an option, and that all relevant new features coming to Procreate Dreams will also be added to Procreate. To me that sounds like there's a good chance they'll add iCloud sync to Procreate soon!
And thank you HN. You’ve helped salvage an artist’s work. Hopefully procreate will back up their art to iCloud one day.