He's still mathematically correct. The huge increases CANNOT continue. It's simply impossible. For it to keep the exponential increase, the next company would have to deliver at least twice as much as KnC, and they'd have to do it within a few days. It will level off.
What is nearly impossible to predict is WHEN it will level off. It seems to be starting to now, but this could be a hiccup.
It's a truism that difficulty can't increase forever, but the steepness of that curve can still turn back more and more vertical very quickly - and will soon enough. Hashfast and Cointerra WILL ship at some point, KnC and Bitfury will continue to make units as quickly as they can, for as long as they can do so profitably, and others will join in also, for as long as it remains profitable to sell mining hardware.
I am happy to see the recent decline in the steepness of that curve - but I am not lulled into believing that it is a long term change.
Make your
BTC while you can.
Every time a manufacturer delivers, the cloud's hashrate gets larger, which makes it that much harder to make the same impact on the next delivery... Not too hard to understand.....