The evaluation of their experiences and knowledge are from the actual contents they have posted. Numbers of posts don’t mean anything.
If you know the game, you have the ability to evaluate what calibre the player is from his contents.
In game metrics is flawed, some players are better players than knowledge based or vice versa. We don’t know if the metrics shown are from his design or copy paste builds.
For a knowledged content, it should contain formula, mechanic information or smart/logical/unique ways of gearing/aspects/paragon pathing.