I came across this:
And this is the wiki-article I meant:
https://wiki.archlinux.org/title/Laptop/ASUS#
Other Lenovo users seem to have had problems as well:
https://forums.lenovo.com/t5/Pre-Installed-Lenovo-Software-and-Applications/Battery-Charge-Threshold-Lenovo-Vantage-not-working/m-p/5018175?page=5
I hope this helps.