That's interesting.
If that DID actually happen, that's great. And come to think of it, I think on one of the featurettes found on the 1989 SE states that Burton did infact walk around with a copy of "The Killing Joke" telling fans that his film would look more akin to TKJ, than the 1960's tv show.
Which was obviously a huge concern at the time.
Oh, to evesdrop on that conversation ....