That tip is definitely unhelpful.
Everything affects whether someone uses your pawn so make sure your pawn is useful as that's really the only encouragement to offer aside from straight out sharing your ID and asking people to use your pawn (and maybe offering other incentives that way).
All of this is covered on the wiki and various forums, but here's a rough outline of how to make a pawn useful for others and thus encouraging them to use it.
- Friends - Pawns are most used by friends because they're free for friends so make friends with people playing the game (usually lower level than you).
- High ratings - Opinion matters so again, make a useful pawn.
- Good equipment - Users won't have to give (or have) better equipment for your pawn.
- Complement of appearance, skills, vocation and inclinations - all of these affect your pawn performance and a messed up AI or build that is not useful (or worse detrimental) in combat or exploration or what have you will not earn your pawn many uses. Different builds work for different scenarios so you kind of want to pigeonhole your pawn for specific uses.
- Knowledge - Learning to kill a variety of enemies, exploring many areas and running quests makes your pawn more helpful as well.
- Level - People usually use pawns at or above their level because they are more useful than lower-level pawns so make sure your pawn is suited to help lower-level builds by generally applying the above in tandem with your knowledge of the game earlier than where you are at. Towards the end, this means tailoring your pawn for the harder fights.
These are all guidelines because there is no strict formula to getting someone to use your pawn over another.