Most of the major tire manufacturers have incorporated siping grooves into their winter tread design mold patterns for many years. It's a whole different thing than distributor pre-consumer razor slicing (which the mfgs don't recommend).I thought the Pinza are siped at factory. From the TireRack website….
Utilizing a computer-aided design, the Pinza AT's four groove tread pattern is built to provide a rugged, off-road look that retains respectable road manners. The multi-pitched pattern employs aggressive biting edges in the shoulder elements along with a higher void ratio for good loose-surface grip. Full depth siping and large zig zag circumferential grooves help increase wet weather traction and hydroplaning resistance for enhanced confidence in wet and wintry weather.
Discount Tire (which is considerably larger than LS) does not recommend nor will they provide tire siping for their customers.
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