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Tire flat spotting is normal for performance tires, but should be completely gone after 10 - 15 miles or so of driving. There is a bulletin that covers that.
So the answer to your question is --- after a brief warm up drive and 10 - 15 or so miles, there should be zero shimmy/vibe in your steering wheel.
Take it back, make them fix it until zero highway steering wheel shake.
They just need to follow the bulletin to the letter. Checking wheel runout, tire runout, hub runout, possibly the tires need road force variation balancing... maybe a hub or rotor is out of whack.
If the tires and wheels are in runout spec, and pass a road force variation balance with flying colors, the next logical step is checking/replacing the front hub... then rotor. Those are the only other two components after the tire and wheel that can cause a steering wheel shake.
You could also temporarily... for one drive... I think?.... put the rear tires on the front and fronts on the rear. If the exact same vibe is still there in the steering wheel... it's not the tires and wheels. Or ask the dealer to swap over the two fronts from another Camaro on the lot that does not viberate.
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