To get 23 3rd level slots requires all of their base sorcery points as well as converting all of their non-3rd-level spell slots to sorcery points then converting back to 3rd level slots. Which also means a bit of prep time as you need a bonus action to convert a slot into points (2014 rules only) and another bonus action to convert points into a slot.
Does this take into account using sorcery points for extra casts or using the evocation wizard max damage ability?
To get 23 3rd level slots requires all of their base sorcery points as well as converting all of their non-3rd-level spell slots to sorcery points then converting back to 3rd level slots. Which also means a bit of prep time as you need a bonus action to convert a slot into points (2014 rules only) and another bonus action to convert points into a slot.