Perhaps, I suppose. I don't know enough about the physics and control of the abrasive techniques referenced. Though, I'm always in favor of emphasizing plausible variables that weaken a hypothesis.
What are the chances that abrasion work like that, hypothetically, was so specialized and unknown in 10,000 BC that Gobekli Tepe's high relief sculptures are the sole examples of that period and the earliest examples of such large and truly technical work? Nevermind the artistic skill that is reflected.
Cro Magnon was carving anthropomorphic stone statuettes in the region of modern Germany in 40,000 BC.
Food for thought: the Tell archaeological sites that dot the Fertile Crescent, which includes the Haran area (Gobekli Tepe), contain the most concentrated evidence of human technological firsts that seems to exist. Including evidence of earliest metalsmithing tech, if I remember correctly. See Yarim Tepe for a jumping off point.
So the situation is:
a. Stone carving predated Gobekli Tepe by at least 30,000 years b. The earliest known stone carvings were not in the region of Gobekli Tepe. Implying that stone carving culture and tech was known far outside of Mesopotamia, from an extremely early period. c. Gobekli Tepe's specific accomplishments are the first evidence that we have of such advanced sculpture and megalith construction skill. d. Metalsmithing arose in the immediate regions and cultures that included the area of Gobekli Tepe.
So on one hand we have widespread tech suggested to be responsible for highly technical stonework in one area, and on the other we have specific tech (metallurgy) arising out of that same area.
It could be a coincidence, but arguably it would be a large one.
Add time to that, so that your project can have a scope of generations, passing down knowledge gained from a lifetime of doing this particular thing, the results become unsurprising even.
Amazing, inspiring and ingenious but also unsurprising.
I guess industrialization has made lot of people oblivious to this fact.
Whatever metal objects from ancient civilizations we know, are either grave goods (swords of warriors etc.), or were found in shipwrecks etc., or were found in destroyed settlements, plus a few accidentally lost (fell into a well etc.). But most metal objects get recycled.
From what I recall, until iron/steel was invented, it was pretty much abrasion as bronze was not hard enough to chisel nearly every stone.