If you measure from the strap to the end of the platform and then from the strap to the point where teeth touch tree, and divide large distance by smaller, then you get the possible force multiplier on that strap (just a lever)
On a hardwood where things don't compress much and the user might do a harder cam over by shortening the strap too much....that platform style can generate a huge amount of force on the strap.
The style of platform similar to ol' treestands where you slide down into the tree just makes more sense. Even if you toe cam the platform, you still have the flex in the post to take force off the strap.