User blog comment:Kaido King of the Beasts/Chapter 818: Stepping Stones to One Piece/@comment-4374114-20160303195953/@comment-3177945-20160303223220

There is probably another way to read them, maybe another poneglyphs that shows you how to translate them. They did say the knowlegde was passed down, good chances that Kaido already knows what is written on his. But he's not the only one after it