Ya. Ok. But pacman does not let you use the AUR. Using the AUR is one did the primary reasons to choose Arch.
So, if you want to use the AUR, you need to use something like yay or paru. And, if you do, you no longer need to use pacman.
To be clear to the newbies, pacman -Syu updates your entire system ( except packages from the AUR ). yay -Syu updates your entire system, including packages from the AUR.
If you just ran yay -Syu, running pacman -Syu will report that there is “nothing to do” since your system will already be up to date.
The same is true if you sub paru for yay above.
Use Slackware to Linux like it is 1993. Nothing wrong with that.