He clearly identifies it as d.pro ; which is what I compared it to. The article doesn't reference a path only the title. There is no e.pro version in "osborn-tree6" but there are a.pro, b.pro, c.pro, and d.pro versions.
The e.pro file you reference is yet another version of this program - but it still doesn't look like what was in the article. (another screen shot - kept the title in this time)
Darn good catch though ! Makes it more confusing than ever!