Coding in the language of the domain is generally a good principle and having a Ubiquitous Language can be a very valuable property of a system, but if the language is flaky and development is kept out of the loop (which is the impression I'd get in case of your hypothetical scenario), chances are there is no buy-in from the business side into a domain driven design of your system. In that case, I would make it dependent on how grave the changes in terminology are, and how much effort is required, and how risky it is to do changes in the code, whether or not I'd refactor promptly or just make a note somewhere.
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Coding in the language of the domain is generally a good principle and having a Ubiquitous Language can be a very valuable property of a system, but if the language is flaky and development is kept out of the loop (which is the impression I'd get in case of your hypothetical scenario), chances are there is no buy-in from the business side into a domain driven design of your system. In that case, I would make it dependent on how grave the changes in terminology are, and how much effort is required, and how risky it is to do changes in the code, whether or not I'd refactor promptly or just make a note somewhere.