I suspect that the message appears if you solved O82 and have a very low number of misses over all the puzzles. From his posts in the other forum, I know that he was upset when he put out a new update and all the new puzzles were solved in a very short period of time. I think he would consider...
Congratulations! I got it! At first I thought the background color had something to do with it, then I thought it might be an ambigram, then maybe a Caesar Cypher, not even close. Well congratulations again!
Note on O81.
The ASCII hint still bothers me.
I tried every number from 1 to 1000 as an answer and none even gave a CBNC, so I don't think any sum of the values can be the answer.