You can also wonder if 'technique' is understood here as (only) the fingers/arms in motion, or the technique as described by Heinrich Neuhaus - as a complete mental image, a complete understanding and knowing of what is written down and hearing it inside your head, which should hardly need conventional fingerexercise (btw. this is quite similar as how Arcadi Volodos describes his own technique - saw him play rach3 last week, just couldn't believe what I saw...).