Did you also follow the basic plugin instructions on wiki https://www.domoticz.com/wiki/Using_Python_plugins

Of course not! Why would I do a silly thing like that??

I just assumed python was pre-installed on Raspberry OS. Silly me.....

I have the latest version of Domoticz installed. Installed this plugin. No Wled option appears in the hardware dropdown. Anybody know if this plugin works lately?

Followed install instructions to the letter.