You're completely out of touch. If you're explicitly choosing to receive an early pre-mass production batch with unfinished battery, you already know what you expect.
So maybe read what they're writing more carefully, you've already got all the answers here.
The mass produced phones that started shipping mid-2021 have 4500mAh battery and, with current software, reach about 20h in suspend with modem on and connected. Due to component shortages and other delays it's still shipping through backorders, although the queue is near its end right now.
It sounds like they’re still not ready.