He talked about using a router bit he has. He intends to severe the root, then route the root away where it makes contact with the trunk. I have to believe he's going to be careful and not cut any of trunk. He calls it an experiement that he might learn from.
I initinally contacted him about my sick tree thinking it was nutrient deficient, not knowing about the girdled root. His firm was going to deep root feed. He confessed later that he only looked at the tree from the street on his first visit, and didn't see the root trouble. On his second visit is when he discovered the root problem. I met him at the house on the second visit, and we talked about the possibilities. I think he was hesitant to cut the root, but I told him I realize the tree might die, and that without root removal it was sure to die.
Now, about its health: Several branch ends are missing leaves. The leaves are small, light green. I see no bugs on the tree. The brances with the missing leaves appear to be dead (not pliable and easily snap in two). I've seen this condition for at least 2-3 years. I first thought it was chlorosis, so that's why I said o.k. to deep root fertilization. But I did research, got two other arborist opinions, and found out the truth about girdling.
Here's a link with my root/tree pics, with root exposed
http://dallastexas.ezhoster.com/GIRDLED ... _TREE.html