Er no. I pointed out that if people got fed up seeing non-relevant albums in the NRFY, they could prune their list back. Some people apparently don’t like seeing Celine Dion albums in their list for example. 
Nothing to do with training the machine - and in fact Brian pointed out a few posts into the thread that pruning the list has no effect whatsoever on training the machine.
I see now that my opening sentence could be read that way. It wasn’t my intention - so I’ll edit the post to rephrase it and make it explicit that no machine training is done by pruning.