Siri recordings are uploaded to the cloud for transcription, and reviewed by third parties to improve transcription and the AI. It also can arbitrarily decide to query search engines to answer questions.
So, better, but nowhere near "on the device only".
When you use Siri the things you say will be recorded and sent to Apple to process your requests. Your device will also send Apple other information, such as your name and nickname; the names, nicknames, and relationships (e.g., “my dad”) found in your contacts, song names in your collection, the names of your photo albums, and the names of apps installed on your device (collectively, your “User Data”)
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By using Siri, you agree and consent to Apple’s and its subsidiaries’ and agents’ transmission, collection, maintenance, processing, and use of this information, including your voice input and User Data
So, better, but nowhere near "on the device only".
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