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They are using the term “white nose podcast” as an (intentionally oversimplified) term to include all podcasts that people use as a background soundscape. This includes sounds of nature, cafes, etc.
They could still generate these more economically on the client. Download a set of samples and the algorithm that generates noise out of them. Or just the algorithm, if no samples are required. If someone listens to this for more than a few minutes, it may already pay off, depending on the size of the samples.