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Notes -
This is not correct. The best analog recording media have signal to noise ratio around 70 dB without noise reduction (ie. dynamic filtering). With noise reduction > 90 dB SNR is possible but you get artifacts as a tradeoff that depend on the noise reduction method.
Analog sources can quite trivially have > 100 dB SNR. A simple example would be a high quality oscillator that's switched on and off.
This is a bit of a simplification in that it only considers the variation in short term loudness. You need to additionally consider the difference between the short term loudness and quietest audible element at that moment (somewhat less than 70 dB). Not coincidentally this 70 dB combined with 20 dB loudness variation is close to the CD limit of 93 dB (3 dB lower than the theoretical 96 dB due to dithering).
24 / 32 bits is of course extremely useful for recording and processing audio as you don't need to optimize the recording levels nearly as closely (and risk clipping) and avoid excessive noise accumulation over various processing passes. There are even recorders that combined multiple converters internally to record the entire dynamic range possible with room temperature electronics so that the resulting SNR is always optimal without ever clipping until the operating voltage limits of the recorder itself are exceeded.
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