Ekka, I think you are right on the mismarketing. It seems like a decent enough pulley, certainly is streamlined, looks like it would work as either a primary tie in as an adjustable false crotch or as a tie in for a secured footlock with your climbing setup run through the pulley and attached to yourself in a normal manner. This would allow you to proceed working at any point in your footlock climb.
I disagree with Treemachine (sorry) on friction not making much difference. By far my favorite set up to date is with using the Rock Exotica swivel pulley (that does have swivel side plates for mid-line attachment and is rated for over 8000 lbs and is cheaper) as an adjustable false crotch for my primary tie in point. This, run through a Lockjack, produces virtually no friction. I can easily tell the difference between using it and using a friction saver.
Kill the friction, save the climber.
D Mc