Sadly no. It fails to import the arch key when I attempt the update.
$ sudo pacman -Su
:: Starting full system upgrade...
resolving dependencies...
looking for conflicting packages...
Packages (2) archlinux-keyring-20210616-1 manjaro-keyring-20210622-1
Total Download Size: 1.07 MiB
Total Installed Size: 1.49 MiB
Net Upgrade Size: 0.01 MiB
:: Proceed with installation? [Y/n] y
:: Retrieving packages...
archlinux-keyring-20210616-1-any 964.0 KiB 229 KiB/s 00:04 [########################################] 100%
manjaro-keyring-20210622-1-any 126.6 KiB 278 KiB/s 00:00 [########################################] 100%
Total (2/2) 1090.7 KiB 228 KiB/s 00:05 [########################################] 100%
(2/2) checking keys in keyring [########################################] 100%
downloading required keys...
:: Import PGP key 77193F152BDBE6A6, "Arch Linux ARM Build System <builder+n1@archlinuxarm.org>"? [Y/n] y
error: key "77193F152BDBE6A6" could not be looked up remotely
error: required key missing from keyring
error: failed to commit transaction (unexpected error)
Errors occurred, no packages were upgraded.
I will try restoring the gnupg directory from snapshots.