“The general consensus today is that such fears were overblown and those “corrective actions” taken at FDR’s orders were wildly inappropriate.”
As is generally the case, the general consensus is generally mistaken.
A significant number of persons of Japanese descent residing in America and its territories were providing information to the Japanese.
I've seen no data on that, none.
My impression is that after Pearl Harbor, the Japanese had no serious intelligence gathering operations in Conus.
Accusations against over 100,000 interned Japanese civilians seem to have no basis in fact.