That Katz thing is just a mistake.
There are 37 players on the 40-man. 12 of them have been optioned down--Beck, Brennan, Carroll, Johnson, Kahnle, Webb, Ynoa, Smith, Davidson, L Garcia, C Sanchez, Fields.
So 25 of the 40-man are technically "Active", plus the four NRIs- Aumont, H Sanchez, Ishikawa, and May.