Unparsable IF( & Gantt

I'm trying to make my Gantt display carry my current projects out with a hidden "completion date" row and IF= code, but it won't work. If my unhidden completion date cell is blank, I want it to autofill todays date so my gantt will show current projects, but if my viewable completion cell has a date in it, I want it to copy that data into the "hidden gantt metric" cell. Here's what I'm trying to make work:

=IF([Completion Date]@row="", =TODAY(0), [Completion Date]@row])

All columnns are set to Date.

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