[tssva]

I have tried Fedora and battery life was still awful in comparison. Looking at the details of the changes referenced in your 1st link they are for Intel chips or chipsets. My Thinkpad is Ryzen based.

I even tried the beta of Fedora 35 which still had awful power management for me. After a couple of days I installed the latest to tlp to see if it had improved the situation since my last try. Still no where near Windows and requires disabling the new power profiles daemon.

Maybe things would be better for me at this point if I had an Intel based laptop but my previous one was and the situation then was the same.