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I think the point is that a typical battery has a good amount of Ah on tap for cranking purposes but needs to be big to deliver the necessary current, which is where the capacitors come in; When the power demand is higher than the battery can supply, the voltage in the battery drops faster due to internal resistance and the capacitor will then help provide more power for a short period of time.
When my battery needs replacing though, I will probably just grab an AGM battery with a healthy amount of CCA over what is required and forget about it. The capacitors may extend the life of the battery but I could just buy another battery with that money.
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