I'm not sure where you're getting your data. On all my bikes, over 30 of them over the years, when batteries are in good condition and charging systems are working, all batteries have been over 13v after 24hrs after turning off bike.
I've had my VFR for over 35-yrs and the voltmeter is always reporting battery voltage. That's a huge sampling of data. When key ON initial voltage is less than 13v after week off I start looking for new battery because it may leave me stranded.
On his bike, it's obvious fried stator connector isn't charging battery. Whether or not battery can be saved after charging system is repaired will have to be seen.
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