This sentiment is the top comment I'm seeing on every recent Google release. That it's impossible to actually access the tech, or even pay for it.
I heard someone say on the last such thread that you can use their models thru OpenRouter, and that this is much more pleasant than trying to use them thru Google directly. Looks like it's up there already:
Also Vercel:
https://vercel.com/ai-gateway/models/gemini-omni-1.2-flash
If you're using any sort of router middle-man new models are usually easy to try.