If you are basing your decision on a score and that score is statistically derived in some manner, you disclose the score and the range of scores and the reasons behind the score.
I believe they may be just calling it a 'debit score' to distinguish it from a 'credit score'. My opinion is that it will likely still fall under the definition of "credit score".
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My opinion only. Not legal advice.
Say you'll haunt me - Stone Sour