Well, no, the warning you get is not good :
[gmic]-0./ *** Warning *** File ‘/home/davido/.config/gmic/cli_update173.gmic’ is not a valid G’MIC command file.
I think you should try
$ gmic -update again, this is the ‘good’ way to update. Then, check if the file
$HOME/.config/gmic/cli_update173.gmic is a plain text file, and contains the string
If it doesn’t then it means you didn’t get the latest updates, for some strange reasons (maybe web caching…).