Oh - The rather brief Wikipedia article says
...mocked and reviled among modern occultists for his plagiarism (or, more properly, book-pirating) of the Pictorial Key to the Tarot by Arthur Edward Waite...
so I thought that's why you posted the link. Anyway, I never paid any attention to the Waite-Smith Tarot until I found the De Laurent pdf and did some googling, and then, spurred on by your post, did some more googling. Now I'm enchanted.
Yes, I thought, the information would be new to you.
Well, it's another point, how to interpret the information and it's value for the historical process, why just this deck took such a hypnotic effect on so much Americans ...
"Author's fame" is often the result of a good marketing process, successful productions are not naturally "the best".
And the whole Tarot-success-story is a process of various forms of plagiarism.
And "Harry Potter" was just the work of a poor author and it's normal destiny would have been to go the same way as other works of other poor authors.