Continuing the discussion from Venema's VTG Figure:
Thanks. The way you worded it in your OP made it sound like Venema wrote the paper and that the figure in question came from the paper itself, not a blog post.
Made an edit:
My thought is that it should be obvious to anyone looking at that figure that it was not intended as accurate to exact scale (note that there is no scale in the figure), and that it would be insulting to the reader’s intelligence to add a note to that effect.