I think it was about ten years ago, like most Eastern European collectors or participants they can be touchy their culture and great (famous) people, historical past, leaders, soldiers and philosophers or inventors.... he started off with some good insights to a Serbian arms inventor or such, as I recall it had some connection to WMO, but naturally being Serbian he finally got around to Tesla, who by any standards was one of the greatest men of the late 19th and early twentieth century. Anyway, it went down hill fast, perhaps because Tesla's greatness to a degree was possible only because of his work in Austria, Budapest, Paris and most of all the United States.
I searched and it was 2014:
https://www.k98kforum.com/threads/kosta-milovanovic.11926/