For new shareholders that had not seen thus, Charl
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He has not publicly said, that I have found, if he is still in the trial. He went silent publicly after this interview about pro 140, which made me speculate that he was asked not to talk about it publicly before it was approved. If so, it would be almost 3 years (back when he started only 325mg was available I believe).
Here is an interview last Nov 2018 that he said at 4m mark the technology is just aces, which leads me to believe he is still on it.