Вот что ответили в поддержке)
It doesn't look like any of the GPU functions are in the list of functions supported for code-generation, so you cannot directly use them in the (Embedded) MATLAB Function block. But you should be able to perform these operations by writing a separate MATLAB function that performs the GPU operations, and call your function using the coder.extrinsic directive. If you are using an Interpreted MATLAB Function block, you don't have to worry about code-generation support, so these functions should work.
Создали М-файл функцию (где используем GPU) и вызываем ее из MATLAB Function block (симулинк) используя предварительно coder.extrinsic дерективу, работает

))