Czuch, Grenv: There's no doubt that slotting the five must use the one so you can assume that 24/23 is a typo and should be 24/22.

However, that opening rolls article is the easy-to-use one and is older than the Opening Move Rollouts (link at the foot of that page) which show 13/11 6/5 to be the best move for 2-1 except in the gammon-save situation.

So for a nice read use the opening rolls page and for accuracy you should go by the Rollouts page.