Maybe he means like jazz musicians? (I'm one.) Every musician I know has transcribed solos. You pick some solo you like but have no idea what they're doing, transcribe it, and learn to play it along with them. Bits and pieces perhaps will rub off in your own playing. You don't want to sound like them, but it's good to be able to if you want – and for that you need to absorb their style, so your body can just go into that mode, without having to think about it. I'm a piano player but have also transcribed sax, trumpet, bass lines, gospel songs, reggae, funk, .. even taps dripping, babies crying etc etc.
Maybe he means like jazz musicians? (I'm one.) Every musician I know has transcribed solos. You pick some solo you like but have no idea what they're doing, transcribe it, and learn to play it along with them. Bits and pieces perhaps will rub off in your own playing. You don't want to sound like them, but it's good to be able to if you want – and for that you need to absorb their style, so your body can just go into that mode, without having to think about it. I'm a piano player but have also transcribed sax, trumpet, bass lines, gospel songs, reggae, funk, .. even taps dripping, babies crying etc etc.