Not quite: fastchat is the inference code which is Apache 2.0 but distinct from the model artifact. If you look at the model [0] it is licensed as non-commercial.
But why?
Well for one, Vicuna is a Llama finetune, which already excludes it from being Apache 2.0. It's also finetuned on OAI data which is... questionable in terms of license (don't think you can really legally license a model trained on OAI output as Apache 2.0 - although OAI doesn't really play by its own rules so who knows)