My thinking is that Dave meant by the word "engagement" that they would not disclose their discussions, interactions, conversations with the RAs. "Engagement" in the sense that he used it can mean the back and forth between the company and the RAs.
As for the PIP, he was likely pointing to it as an example of what they would PR, despite the fact that it may not be officially considered a "material event", because they felt it was "material" to PR it to their shareholders, especially because the same SAP was being used, and the ECAs were to be matched in same manner the P3's ECAs were.
May I suggest that you respond to him and ask if he thinks a MAA should be PR'd upon submission, or upon acceptance, since that issue may have been the question you were looking to get an answer to?