Larry, I strongly believe you are correct. I have studied the "giant" flytraps for some time and the Dingley Giant is described as you have it. I have also seen a few rare photos of the plant. I also have a small plant of it myself.
Nope. I have friend who lives in um......australia or um somthin....and well he described the plant as long petioles, not quite directly erect, large traps that can gain a solid red hue. I emailed him just 1 month ago to ask him about this plant. This guy know quite a bit about VFTs.