Gemini 3.0 isn't broadly available inside Google. There's are "Gemini for Google" fine-tuned versions of 2.5 Pro and 2.5 Flash, but there's been no broad availability of any 3.0 models yet.
Source: I work at Google (on payments, not any AI teams). Opinions mine not Google's.
Based on what I'm hearing from friends who work at Google and are using it for coding, we're all going to be very disappointed.
Edit: It sound like they don't actually have Gemini 3 access, which would explain why they aren't happy with it.