Well, at least he's trying ECS.
Legrand many have tried to solve the ciphers and many "possible connections" outside of the 1885 Beale Papers have been proposed on several threads on this site and in other media.
What they all have in common is the TOTAL LACK of any corroborating evidence that connects to the story in the Beale Papers, or to Ward, Sherman, or 1885 Lynchburg where the job pamphlet was advertised in the LYNCHBURG VIRGINIAN for sale.
The other lacking corroborating evidence is any documentation that the expedition adventure related in the job pamphlet, ACTUALLY ever happened.
Many could have, may have, have been offered up as speculation, but all fall short under examination to being related to the Beale story.
Now when one looks at the extended James Beverly Risqué family bloodline, Thomas Beale in a duel over Julia Hancock with Risqué, one discovers in that extended bloodline through birth or marriage, Robert Morriss, James Beverly Ward, John William Sherman, and the Bufords' of the mentioned tavern- names the residents of Lynchburg and Bedford were familiar.
The other names in the job pamphlet were also known by those of Bedford county-Jackson,Clay, Coles, Witcher,Marshall, and a contemporary of the 1885 publication, businessman, Max Guggenheimer.
These names would not be known by Poe, Emerson, or to the residents of New Orleans, the most common Thomas Beale search city due to his business holdings there and his part in the Battle of New Orleans, and yes, because of that connexion, Jean Lafitte's name has been thrown into the Beale speculative stew.
The point being made, without the slightest outside corroboration to confirm the story, the story, the treasure, and the ciphers become suspect, and the familiar names employed in the Beale Papers are used as a literary device to sell the work in 1885 Lynchburg.
As codebreaker, William Friedman noted about the DOI solved C2, "diabolical ingenuity, specifically designed to lure the unwary reader".