Yes, calamares is explicitly installed:
pacman -Qi calamares
Name : calamares
Version : 3.3.0alpha2-28
Description : Distribution-independent installer framework
Architecture : x86_64
URL : https://calamares.io/
Licenses : LGPL
Groups : None
Provides : None
Depends On : qt5-svg qt5-xmlpatterns qt5-location kconfig ki18n kcoreaddons solid kpackage plasma-framework yaml-cpp parted libatasmart udisks2 polkit-qt5 kpmcore kparts kdbusaddons libpwquality
qt5-virtualkeyboard zfs
Optional Deps : None
Required By : None
Optional For : None
Conflicts With : None
Replaces : None
Installed Size : 9.42 MiB
Packager : Anke Boersma <demm@kaosx.us>
Build Date : Thu 13 Jul 2023 05:46:54 AM EDT
Install Date : Sun 23 Jul 2023 09:16:02 AM EDT
Install Reason : Explicitly installed
Install Script : No
Validated By : SHA-256 Sum