I don't use Deep Research or NotebookLM myself (or any other generative AI product). But every example of a NotebookLM audio overview I've seen was actively misleading and ignored critical context. However the voices were very personable and entertaining! Likewise Deep Research uses terrible sources and often gets things wrong, I have yet to see a single example that holds up to scrutiny...but it sure goes down smooth compared to reading a bunch of disparate papers!

I suspect Deep Research and NotebookLM aren't used to get information so much as to provide extremely low-quality infotainment. I read Wikipedia recreationally and I can definitely see the appeal of having a Wikipedia-like article/podcast for anything you can think of. But they seem miserably bad for actually learning stuff (especially the stupid podcasts).

Maybe it's an Gemini advance only feature but you can generate audio overview right there in gemini interface.