You can’t start custom commands from voice commands.
Since you only give 1 line of logs I can’t really check all, but to start a plugin you need to use the plugin name and preferably start plugin XXX else in that case it tries to actually do WOL.
If you Kodi device is on linux you can also use scripts like Kodi Starter script for linux: Linux script to start Kodi from Yatse (NeoAcheron) to intercept the WOL command and do anything you want.