Hi Ken.
My suggestion is that he needs to move further South! ;-)
Just kidding. I am always amazed at the success Northern growers have with figs, and my brother in Maine is now growing a Hardy Chicago. And as others report the Marseilles VS is outstanding in quality, productivity, and cold hardiness, a real winner. My mother is also going to try these near the Chicago area starting this Spring, in-ground (I know; a bold experient) in a well protected area by a South facing brick wall.
As a former Midwesterner though, the problem is not only cold, but wild swings in temperatures. A few warm weeks in early Spring can commonly be followed by several feet of snow and freezing temperatures.
Nonetheless, I'm sure it can be done, and the rewards are well worth the effort.
Hope you are well my friend.
Best wishes.
John
North Georgia Piedmont
Zone 7b