Tried an update today and get an error as follows
looking at the repo I see https://repo.armtixlinux.org/system/os/aarch64/glib2-2.70.0-2.1-aarch64.pkg.tar.xz so I suppose the repo db index is ahead of the actual content.
Edit: the update is now working as expected.
Passing two -y or --refresh flags to the -S command will force a refresh of all local package databases by downloading a fresh copy of the master package database from the server(s), even if local databases appear to be up-to-date:
sudo pacman -Syyu
The actual version is 2.70.1-1
I had already done the pacman -Sy and pacman -Syy commands; the armtix update is now working.