I'm a bit further north on the lower peninsula.
Had a lot of autumn olive "die" this year due to harsher than recent normal winter weather. This seems to happen periodically to some of the plants within the genome.
I would say about half of the large population of autumn olive in the Grand Traverse region appear to have died back, but not died out.
If you will look closely at the base of the plant, I bet you will see new shoots coming up this summer on many if not all of the plants that appear to have died.
Give it all a couple of years and your shrubs will be back to looking good and bearing fruit.
The last two winters have seen what I consider to be near normal winter conditions. What seems to get the autumn olives are either a hard and deep freeze greater than minus twenty ... or a prolonged period of sub-normal temps without a break. Something like two weeks of nothing above freezing may be
enough to knock the tops out of the autumn olive.
If not the cold, then meadow
voles working under the snow cover can girdle the stems down low, almost out of view, and create the same effect. The plants will come back in most cases.