There is a world somewhere between reality and fiction. Although ignored by many, it is very real and so are those living in it. This forum is about the natural world. Here, wild animals will be heard and respected. The forum offers a glimpse into an unknown world as well as a room with a view on the present and the future. Anyone able to speak on behalf of those living in the emerald forest and the deep blue sea is invited to join.
From the sounds of that first email, the professor probably gave that information because he was under the impression that Alex was a professional from an academic or scientific institute, rather than an enthusiast who intended to post the information on a message board. He was also asked by at least three people (Alex, Bruce, and Charger) separately in the space of a short amount of time. That alone may have led to his decision to block.
When contacting experts in the field, I advise that it is best to be upfront about who you are, why you want the information and with whom you are intending to share it, and explicitly ask for permission to share private correspondence. Further, to avoid bombarding the researcher with multiple requests from multiple people on multiple platforms - which is very likely to lead to you being blocked - I suggest simply forwarding the email to those who want the proof (but only of course if permission to do so has been granted from the researcher).