If you are willing to disregard the explanation of the meaning of a text by its author in order to reinterpret it, you're on the wrong way. It is absurd to argue rigidly that "the DFSG obviously doesn't say that" when its author says it is.
To point out what the words of the DFSG actually say is surely appropriate for understanding it. I don't think that a message from Bruce Perens, proposing an interpretation that is contrary to the words, settles the issue. It is up to the Debian developers to decide Debian's interpretation of the DFSG, but if they choose an interpretation which is not what the words say, I hope they will recognize that they could choose a different one.