CD, continuous deployment, is used to refer to the process not an individual instance like the term ATM. Simply saying "This deployment failed" doesn't convey that it's a deployment that was made through CD but "This CD failed" is also ambiguous as it doesn't indicate whether the process or the conditions particular to a deployment that caused it to fail. Using them both in combination like "CD deployment" seems perfectly valid to me to resolve both ambiguities.

To be fair though they were referring to CD deployment(s), plural, which is a bit redundant and just CD would have done just as well in this case.