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Your reasoning makes sense to me. My father used to own an ice company. Part of it made huge 300 lb blocks of ice. Essentially the floor was a huge ice tray with removable copper molds held in a grid. The molds were surrounded by salt water that was chilled to well below freezing. The water in each mold would freeze from the outside in. Before each block was completely frozen, the unfrozen water in the center would be suctioned out as it contained all the impurities, now concentrated. That water would be replaced with fresh water and allowed to completely freeze.
Not a scientific answer but a practical experience that backs up your theory.
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