The rosetta Stone translated into a proclamation about recsinding certain taxes by Ptolemy V.

?OBKRUOXOG HULBSOLIF BBWFLRVQQ PRNGKSSO TWTQSJQ SSEKZZWAT JKLUDIAWI NFBNYP VTTMZFP KWGDKZXTJC DIGKUHUAUEKCAR

The word "Eureka" can be found in the last part of the cipher if the letters are rearranged.

DIGKUHUAUEKCAR

"UEKCAR" rearrange the letters and drop the "C" to get "Eureka". The Rosetta stone was in Greek, Coptic and another dead language of hieroglyphs. King Tut, Carter et al, dealt with death. Archimedes worked for the Ptolomys.

Maybe its something like, "Nothing is certain but death and taxes"

But some words are in Greek, some in Coptic, or maybe even French.

The sculpture looks like the Rosetta Stone in form and mass.