Hi alessandropintabona,
Short answer - the FreeRTOS is not integrated in Simulink Blocks.
I'm responsible for creating that slide deck - and now I see that unintentionally I've introduced a misleading information. Sorry for that.
The scope of the slide was to show that the entire code-generation sits on top of the NXP's official SDK release which in turn is a SW production ready software. The FreeRTOS is part of the SDK collection of features and so far Model-Based design is not covering 100% of SDK feature (FreeRTOS being one of them)
Hope this clarify the confusion.
Best regards,
Daniel