Man, this would truly be a remarkable discovery. Like everyone else who replied, I would LOVE for this to be true but people grossly overestimate size in snakes. Especially with photos from far away.
Colonel Percy Fawcett's anaconda that he discovered was 62ft (according to his measurements, not confirmed). If his story is indeed true, these animals could very well still exist in untapped forests. We'll see...Though 40 meters is incredibly unreal, that's like 130ft or more!!