The comment about the German name was a note of irony given who was posting the info. In no way did I dismiss it because of the author's name.
As I said, it is a bit of info, but I'd like more.
R S Dickson may be the name you're looking for as to the wing engineer, but he may have just been an understudy. I'm not sure.
There are four levels here:
1) The Spitfire wing is a direct copy of the He70 wing
2) The Spitfire wing is based on the He70 wing
3) The Spitfire wing was infuenced by the He70 wing
4) The Spitfire wing was designed completely independantly of the He70 wing
I would tend to bet on #3.
Here is an interesting tidbit for you, after the He112 lost the industrial competition to the Bf109 (many people, including the pilots were surprised by that), some of the He112s were sold to the Japanese navy. The IJN hated them because of their heavy, by IJN standards, wing loading. However Aichi took the idea of the elliptical wing and used it in the D3A "Val".