You can indeed and should assume there is a heavy JIT component to it. At the same time, it is important to note that this is geared for already highly parallel code.

In other words, while the JIT can be applied to all code in principle, the nature of accelerated HW is that it makes sense where embarrassingly parallel workloads are around.

Having said that, NextSilicon != GPU, so different approach to acceleration of said parallel code.