it's actually half good, half bad advice. I dont think he means literaly copy their sounds, their riffs etc etc, but studying certain artists sequencing or tracking down will do a person wonders who is just starting out, as getting whole tracks down and laid out in a comprehendable sequence can be the real pit fall for alot of new people starting out. It certainly was for me, but being a DJ anyway helped me overcome that quickly.

learning how to effectively build up a track to a break, and work a breakdown, is incredibly difficult starting out. You listen to people like Speedy J and i tell thee he did not start doing those massive, intense breakdowns the first time he ever opened a sequencer and a synth.

Dont copy a persons sound no. Thats a massive no no, but there is absolutley nothing wrong with studying other producers actual techniques and applying them to your own learning. More often than not this is when people can spot differences in the techniques and start to build their own way of working.

but yeah i think it was worded a little wrong maybe ;)