bob smith is the guy you are thinking of and 2014 or 2015 was the last time i bought any from him but he old me he got his from paraguay. it does come from both countries though so he could have had a mix.
interesting to hear what the argentinians are doing to the species...
i used to use it for my skittle balls but we can't get more cylinders and it was getting stupidly expensive so i have changed to a timber called Angelim Vermelho (Dinizia excelsa) which is not quite as heavy but is a much bigger tree and available as beams.
Dave, was the cylinder green when you turned it?