YEs, except that, in most cases, the wind-up move is accompanied by additional movements of the hands / arms that indicate it's a pitch. So, despite the (legal) foot movement, it's now illegal to throw to first.
The original post doesn't ask about pitching
from the Windup position. This discussion is
about a pickoff attempt from the STRETCH position.
From the Windup, this foot movement would be
illegal once he has made any natural movement
associated with his delivery. He is then
committed to pitch. 8.01(a)
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