I skimmed parts of the video very quickly, did not watch the money shots, as it were, yet....
However, if there is advantage to this, It is certainly now possible to make "bare" rails with durability that might not have been possible in gum/natural rubber without cloth as long term protection.
Polyurethane.
I cast polyurethane sets for planer rolls, for myself and a couple others, over 20 years ago.
Not exactly mar-free - these are working machines in pro shops.
But the durability is there and for pool balls which would apply very little abrasion, the rails would probably last as long as the glue held up to the structural/subrail. Un-filled/near pure poly never seems to age harden, either.
smt