the email says to me cervelo will not make definitive pronouncements on compatibility on everything so they cannot be accused of misleading information and it is up to you to check it fits your other stuff before you buy.

They are saying check yourself to be sure; it is not up to them to do this for you for all brands from all years. It is a non-answer plus some useful info to help you check. Sounds like a pretty responsible company and not a fail.