Ah, I see, the first chart clearly says AA in the caption and I glanced over that. The chart for the Ansmann button cell with a 22 Kohm resistor is at a steady current of 68 microamps which is much like what a button cell probably sees.
Here's some specs from Maxell for silver oxide and alkaline button cell batteries (click on the Specs tab): https://biz.maxell.com/en/primary_batteries/sr_coin.html The SR44 has a nominal capacity of 165 mAh and nominal current supply of 200 microamps, and the LR44 has a capacity of 110 mAh and nominal current of 100 microamps, which supports the usual statement that silver oxides have about 1.5-2x the capacity of same-size alkalines. I suspect this is one reason why camera manufacturers specified the silver oxide and tell you not to use the alkaline, especially in electronic shutters - it's not going to hurt anything (other than the meter accuracy), but it will die sooner and they don't want the user to complain about dead batteries.
Here's some specs from Maxell for silver oxide and alkaline button cell batteries (click on the Specs tab): https://biz.maxell.com/en/primary_batteries/sr_coin.html The SR44 has a nominal capacity of 165 mAh and nominal current supply of 200 microamps, and the LR44 has a capacity of 110 mAh and nominal current of 100 microamps, which supports the usual statement that silver oxides have about 1.5-2x the capacity of same-size alkalines. I suspect this is one reason why camera manufacturers specified the silver oxide and tell you not to use the alkaline, especially in electronic shutters - it's not going to hurt anything (other than the meter accuracy), but it will die sooner and they don't want the user to complain about dead batteries.