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First, the tutorial you are referring to is for Vitis-AI 1.3, which is important to identify.
Second, the arch.json file you are looking for is generated when a Vitis-AI with DPU is created for any given board.
Xilinx provides arch.json files for their pre-built Vitis-AI designs (ie. ZCU102, U50, etc...).
For the Ultra96-V2, I recommend using the following Vitis-AI 1.3 design, which has a B2304 DPU (with low RAM usage).
It comes with the following arch.json file, which can be found in the BOOT partition of the pre-built SD card image:
You can use this arch.json file when compiling models to run on this Vitis-AI 1.3 design.
If you generate a design with a different DPU configuration, you will need to use the arch.json specific to that design.
I hope this answers your question ...