This shows us what is in the rpoes .. not what you have installed (use Qi for that).
heroic-games-launcher only exists in the AUR .. it could not be coming from somewhere else.
heroic-games-launcher-bin is in the repos and can fulfill the same depends .. so using a normal package manager should gave you the bin variant whether during install of heroic-games-launcher or if upgrading.
If you use an AUR-helper on the other hand the AUR is enabled and you very well could be getting and upgrading heroic-games-launcher from the AUR.
This has been covered elsewhere for people who do not use the AUR.
Same for NoFlatpak.
As these are also points of failure for the update notifier thing, ex;
In case any user simply needs a one-liner to ensure they have the repo package then here is such;
sudo pacman -Syu heroic-games-launcher-bin