The statement "keep under tension" during the repel is crucial. So using it as top anchor for working the tree doesn't seem like a good ideas as you load and unload your line throughout working the tree.
Otherwise the loading and unloading seem like the same process as unleashing/releasing this device.
Just saw something on this, and thought it was new, but of course the buzz knew about it months ago. I was wondering what everyone's thoughts are on using this as a choking anchor for working down a spar