You could configure the client CFG to skip that message, by setting the following key to ‘false’:
<option key="Show local desktop connection information" value="false" />
Normally this CFG is located in $HOME/.nx/config, but you can start the client with an option to load the CFG from different paths:
/usr/NX/bin/nxplayer --config /path/player.cfg
The file ‘nxplayer’ is a script, you could edit it to add the ‘–config’ option.
Meanwhile we’ll check how to improve the conditions triggering that message to avoid to show it in similar environments.