Making a large, (>5" long) symmetrical, thin, and sharp tool like this (and from poor material, to boot) rquires the full suite of lithic tools & technique: hard (stone) hammers, soft (antler, bone) hammers, and pressure flakers (antler tips).
And... each of those tools depends on an entirely different physical operating principle from the other two!
Now that my hand strength and hand-eye coordination have begun to wane, I might be able to replicate this specimen -- using high quality, glass-like material. But, I'd hate to have my next meal depend on doing so with that granular, difficult-to-work material!
Whoever made the above Solutrean specimen certainly was not a brutish, ignorant , clumsy savage...