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They reserve the right not to record the call, in case the stuff hits the fan and a customer insists on getting a recording of the call where everything went wrong.

The wording is specifically because they want to pretend that only a small share of calls are recorded for quality review and that it is very unlikely that your particular call will be recorded.

Why commit yourself to a stronger statement than necessary? As you probably already know, it's just to satisfy laws against recording a phone call without the consent of both parties. It's just a nicer way to say "we will proceed assuming we have your consent to record this call," without promising or revealing anything further.