From Wikipedia > A fossil fuel is a fuel formed by natural processes, such as anaerobic decomposition of buried dead organisms, containing organic molecules originating in ancient photosynthesis[1] A fossil fuel is a fuel formed by natural processes, such as anaerobic decomposition of buried dead organisms, containing organic molecules originating in ancient photosynthesis that release energy in combustion.[2] that release energy in combustion.

So, by this definition, Uranium is not a fossil fuel.

Despite the many shared traits with some fossil fuels: extraction by mining, finite amounts, subject to geopolitics… uranium is a chemical element and not a fossil fuel, especially the “fossil” part.

This is obviously not correct.