He is not encouraging to sell, he is preparing people of what may come, he mentioned how he is holding 75% of his positions still, he gave an opinion of what very well may be occurring, i feel you didn't understand the point to this article and also you may not have completed reading it either and rather were just against the idea of the 'cartel' so disproved. It is a very well written article with proof, citations and valid reasoning, to all their own opinion. Cheers !
RE: 4th Dimension: Bitcoin-Manipulation-Cartel — Price-Suppression is the Goal