If they had said some thing like "with advanced algorithmic distribution of load instantly as you scale", its wishy-washy enough that its technically correct and those that need to know exactly how it does it will need to go and look at the docs.

As it is, intelligent distribution tells those that need to know that the distribution of load is based on intelligence gathered from the system, so they may not look farther. And it's simply not true.

The intelligent part of it is that it knows which servers and ports your application is running on as dynos come and go, and the routers is updated in near real time to reflect these changes. Since dynos move about frequently, and there are a great many of them starting and stopping per second, this requires much more intelligence than you probably think.

The impressive-sounding alternative is "stochastic".

FYI, this is probably because you saw his comment at around 0-1 minutes. If you click on "link", you'll get the Reply form... or refresh after a minute or two and the "reply" link will be available.