I'm fairly sure that the saltwater curing is not exactly a Lakota technique. I could be wrong, but I've been all over the Dakotas, Wyoming, Montana and the Minnesota and Wisconson woods whhere they originally came from and I didn't run across much salt water.
I'd love to have someone put this to a controlled test with a set of sister staves taken side by side off a tree. One air cured for 24 months and the other stewed in seawater for the same period of time and then air cured to a matching relative humidity. Be a heck of a project, anyone game to take this on?