The Gemini podcast is going to condense your text and make it conversational, but it will necessarily lose detail in the process. A better recommendation is the Eleven Labs Reader, it'll just read any text or file you throw at it with top tier voice models. Can use it for free and they have paid plans for more use. They also have a "podcast" generator option like Gemini, but I haven't tried it so can't vouch for the quality.

I use Eleven Labs all the time for things I want to read, like email newsletters, industry publications, etc but never find the time to sit down and read. Now I can have AI read them to me while I walk the dog. Super handy imo