Think of looking at a abstract painting. If you didn't know the title or the description, you may interpret it different, where that is a valid way to appreciate art. It is how the art speaks to us, not necessarily how the the message was given from the artist.
I can understand that for a painting or sculpture but when it comes to a TV show if too much is open to interpretation, the writer has failed.
Anyway, with his "obvious retcon" line, Cell isn't interpretting the story, he's judging the writer.