Yo,
Thank you for the feedback, always welcome. 
As you note, the card is tagged by a Kaplan chapter as the phrasing is taken directly from the textbook which states “accuracy, also called validity, is the ability of…” So, if there is a discrepancy, it comes directly from a primary source.
In general, we try to hew directly to primary MCAT resources and, at least in this case, it would appear that this is what the primary source states, cringes and travesty notwithstanding.
That being said, anytime you see anything that you feel like merits an update, or correction, or anything at all feel free to use the ‘suggest a change’ feature and the maintainers will take a look at it:
Guidance on submitting suggestions can be found here as well, if it’s helpful: AnKing MCAT Deck Submission Guidelines