I saw the following on that site: "Not since the long-lost Joseph Smith papyri burst upon the scene in 1967 has there been news of this magnitude and import regarding the physical corroboration of Latter-day Saint doctrine and scripture."
Yeah--the papyri corroborate Latter-day Saint doctrine and scripture in much the same way as photographs taken from the Apollo moon missions "corroborate" the flat earth theory.
I had a similar question a couple of weeks ago. The heartland model is all BS -- Meldrum just wants you to purchase his books. See the replies to my post from a few weeks ago: