In the user information of iam, in last accessed information, "Action last accessed information is not available for Amazon S3 data events." What does mean?

I am looking through the docs for the last accessed information.

However, as a NOTE in the docs, “Action last accessed information is not available for Amazon S3 data events.” There was a phrase that said. Here, it is unclear whether Amazon S3 data events refers to all activities that occur in S3 or only specific activities.

We would appreciate it if you could let us know about these Amazon S3 data events.