Thanks to chatgpt and perplexity, so i change to iwd and my journalctl is much more cleaner.
Install iwd
sudo pacman -S iwd
create a config file for KDE network manager
sudo vi /etc/NetworkManager/conf.d/iwd.conf
addd this lines
[device]
wifi.backend=iwd
deactivate the wpa_supplicant
sudo systemctl stop wpa_supplicant.service
sudo systemctl disable wpa_supplicant.service
activate iwd
sudo systemctl enable iwd.service
sudo systemctl start iwd.service
restart network manager
sudo systemctl restart NetworkManager
after that i must reconnect to my wifi with password
now i have a clean journal 
Thank you
mr.pSYc