“Most of the writings which have now been found were secret anciently and held back from the people until they proved their worthiness. “
Sounds like these unnamed “scholars” found some more Gnostic writings.
I would guess that you are correct, since the Gnostic mystery religions of the Mediterranean in the Hellenistic period usually had such worthiness requirements for being initiated into deeper knowledge, etc.
These degrees of intiation are echoed today in various Masonic organizations as well as in recently invented religions like "A Course Of Miracles" that Oprah Winfrey has recently been peddling.
That is most likely the story. Standard 'unnamed scholars' routine (faith building rumor). If the mormons want to associate their beliefs with gnosticism, great! Kinda hard to call yourself the restored church when the gnosticism you embrace was opposed by the first century (and later) church.