Permission Denied for Prebuilt App

[bitfort]

End of README says:
"You can build an IPA of the app using your developer account or a pre-built version of the app and tests can be found here."

With "here" pointing to:
https://s3.console.aws.amazon.com/s3/buckets/prebuiltappsreinvent2017/

But when I visit that ULR, I see:

Insufficient permissions to list objects
After you or your AWS administrator have updated your permissions to allow the s3:ListBucket action, refresh the page. Learn more about Identity and access management in Amazon S3

Does it need to be made accessible on your end?