Do you have the precise reference here?
Presumably it is all in:
"Enthüllungen über den Simonides-dindorfschen Uranios : Zu einem Geschichtsabriss über Simonides"
So a page number will be helpful, is there a post on this question here?
(It does sounds like information that will support the Odessa and Moscow Kallinikos publication in 1853-54. At any event, it is important for Autographa scholarship. From memory, no mention was made of this in the publication by Carmelo Nicolò Benvenuto, and the reference could be forwarded to Carmelo.)
Remember, the issue of whether publications within the Autographa were creative writing from Simonides is quite different than the question of the first publication of the materials, which is a question that arises in the Sinaiticus controversies. One key question is the dating of the publication of the material and whether there was any intent in the publication to support the Simonides narrative on Sinaiticus. My studies to date support the publication dates of 1853-54 as authentic.