You’ve missed the difference. The recorded line was previously for transaction records & training. The new greeting was updated to state that the recordings will be used differently -- to capture your voiceprint. A voiceprint is not merely a transaction record that gets deleted when no longer useful. It’s a biometric. After exfiltration it can be used by criminals to recreate your voice.

Of course nixing the account avoids it. But there are more clever ways. E.g. not calling. Possibly using a voice disguising algo. It’s also possible that the human-to-human chatter is not used for voiceprint capture. Certainly some banks have robots asking you pronounce certain words in the voiceprint capture process. It’s just as well possible that the bot’s menu of commands the it suggests you can use contain words used by the capture algo.