From looking at the blog posted articles, the actual data and the comments in discussion, my opinion is that the blogger was able to successfully test his hypothesis against a competing forgery hypothesis and that he showed valid explanations of the following features:
The presence of multiple monochrome foreground layers and a colored background layer
The background layer contains the full green basket paper
The resolution of the background layer is half that of the foreground layers
The background layer is encoded in JPEG, creating many artifacts
There is a masking layer created by Preview
There is an embedded comment in the JPEG
The 8 bit alignment of two sides of the monochrome images (observed by a previous experimenter)
The alignment of the remaining sides touching the interior (also observed by a previous experimenter)
The Quantization matrices match, and
The scaling and rotations match.
“From looking at the blog posted articles, the actual data and the comments in discussion, my opinion is that the blogger was able to successfully test his hypothesis against a competing forgery hypothesis and that he showed valid explanations of the following features:..”
But NO posted pdf file confirming these claims and no claim of replicating the “floating signature block that I can see.