There are strong opinions among some bowyers that the "backwards" style is a misinterpretation and completely wrong. I would agree except for one thing: the illustration of the Mollegabet fragment does appear to show that the growth rings are cut through on the back of the bow, like a "crowned" bow.
I'm am looking for a more detailed analysis of the Mollegabet bow fragment. Pictures would be great. If the back of the bow is indeed the outer part of the tree, I would like to see if the increased thickness of the outer limb is on the belly side or on the back. If the increased thickness is on the back, then I will doubt that the back of the bow is the outer part of the tree. If anyone has any sources that they would like to share, please do.