Counting on China tariffs to benefit American manufacturing is a flawed strategy.
First, tariffs of 25% are more than offset by low cost China labor, taxes, benefits etc. But the picture is China is already talking about subsidizing China based companies for the tariffs should they impact China based business. China would much rather subsidize than lose the tax revenue, keep their work force employed etc. So with a stroke of a pen this perceived benefit could dissolve itself.