I Planted mine in ground last November(bought it in July) and protected it from frost ,best I could.
It is alive tho the little stem,(just,like yours),Died close to ground but it has 4 buds growing at base now which mean it will start 4 Branches,this Summer.
Looking at your Pix,my opinion,is the leaves,are similar to UCD Ischia Black so there is hope ,no doubt.
I am not implying it is made from wood from UCD,because it is not.
Positivelly is not infected with the FMV,the other have.