I would not be so quick he needs to explain things. As well as answer any question that may arise. i have a feeling he will chose not to though.
I think you are quite incorrect and are simply searching for the next Bitcoin drama. Alex used to be very involved with Bitcoin whhen I was before my hiatus, and I trust him completely. I was very surprised to see this site listed as a scam and am glad he sent you that PM.
Alex always took time to respond to any questions and addressed all concerns in the past. I doubt now will be any different.
What he said in his PM makes sense, I'm not really sure what other sort of explanation you are waiting for.
John