The source code they're talking about is not the training code. The only thing I saw released was their inference code and weights. You can verify this by visiting the following:
To put it another way, when they share the weights for the model, that's like sharing the compiled output for some software - like releasing an executable instead of the source code that can produce the executable. They aren't sharing the things you need to produce the weights (the training code, training data, any preprocessing code, etc). Without those inputs you actually cannot even audit or verify how the model works. The team making the model might bias the model in all sorts of ways without your knowledge.
https://github.com/Snowflake-Labs/snowflake-arctic/tree/main
https://huggingface.co/Snowflake/snowflake-arctic-base
https://huggingface.co/Snowflake/snowflake-arctic-instruct
To put it another way, when they share the weights for the model, that's like sharing the compiled output for some software - like releasing an executable instead of the source code that can produce the executable. They aren't sharing the things you need to produce the weights (the training code, training data, any preprocessing code, etc). Without those inputs you actually cannot even audit or verify how the model works. The team making the model might bias the model in all sorts of ways without your knowledge.