Pipewire is default now.
If you want to return to pulseadio for some reason it should be
sudo pacman -Syu manjaro-pulse pulseaudio-bluetooth
But if pipewire works for you, I would suggest sticking with that.
In general the replacements/reinstalls were the intention. 
This is a longstanding gripe with that notifier.
You can augment the settings, disable it, or remove it entirely.
Its simply informing you that a new kernel series (6.9, not an LTS) is available.
With a poor choice of words.
Not that yours is ‘bad’.
manjaro-settings-manager-notifier
(and/or manjaro-settings-manager-knotifier, but that is for plasma5)
Huzzah.
Happy penguins.