Here's the full video with Dr John Coleman, part of which is in the tweet I posted earlier. In it he details the sources, all official ones.
Beneath the video (Here: https://www.youtube.com/watch?v=WjG3VoX3Ldk|) is over 14,000 comments, none of whom appear to have any doubts about what is the cause of the excess deaths. Dare I say, it's a Teletubby free zone.