It appears that is the 1912 book date of the 3rd generation finding of the petition, not that the Petition was also found in 1912.
The Petition was found by the 3rd generation in Jamestown and lost by later generations. About what Bill Deyo had said is this article explaining much about the sacred oral history of the Powhatans.
https://indiancountrymedianetwork.com/history/genealogy/true-story-... Sacred oral history has Ka Okee mentioned in this article. gives the heartbreaking oral history of Pocahontas and how to spell her dad's name: Paramount Chief of the Powhatan Chiefdom, Wahunsenaca instead of Wahunsonocock. The Patawomeck Historian went on record last summer as not knowing anything about Nicketti, in an uploaded email from his in a discussion on Geni reposted by permission and is found by a google search. But, the non-tribal natives also have a history that does include Nickettii and that has meshed with the Wind Clan of the Creek nation from the 3rd generation daughter of Nicketti and that is another plus for ethnicity and a huge plus in the Wind Clan link to Pocahontas' brother who was Wind Clan, which is very important because clan names are like sir names passed down. Opecankeno is the spelling used in the court petition presented twice and he still had time to be the father of Nicketti as late as 1641 when the petition mentions him. I