errata, blunder, omissions can leave modern readers in the dark - David Parker and Uspensky

[Steven Avery]

The following year a Russian monk. Porphyry Uspenski, visited Sinai. He found some fragments of the manuscript which had been used for bookbinding, and took them back to St Petersburg. David Parker, p. 3-4

Uspensky actually saw the full manuscript, a critical piece of historical information, and described the books (no intimation that Hermas was incomplete). Parker must have known that, so why omit the info?