> But clicking delete or unsend on a photo is not that.

In Google, a user clicking delete is treated exactly the same as a written deletion request.

In fact, the law requires that they be the same - "Therefore, an individual can make a request for erasure verbally or in writing. It can also be made to any part of your organisation and does not have to be to a specific person or contact point.". (https://ico.org.uk/)