If you are in a race where you are just struggling to stay with the group then smart racing = hiding.
However, if you are trying to compete for the win then, unless you are a dedicated sprinter with a team around you to chase moves and pull back breaks, smart racing means hiding when you should and attacking when you should. So hiding is a part of smart racing but you can’t just hide all the time.
Sorry, that’s a super non specific answer because I haven’t listened to the episode yet but maybe that’s enough to answer your question.