Unless you explicitly switch off the charging, the LiPo will get charged during sleep, but I think only with 100mA (by default)
But that's still the same answer you got 5 months ago.
So we can't really do anything against
But you can try it out yourself. Discharge the LiPo, let it print out the
FuelGauge.SoC() value, send the device to sleep for 24 hours while keeping it plugged in and read the SoC value again when it wakes.
Then you know - we already do.