Earlier quoted context omitted.
The headline seems misleading, then. rclone can work with AWS' different offerings, some of which at least partially address this: https://aws.amazon.com/blogs/aws/new-amazon-s3-express-one-z...
I'm not totally sure what you mean. I don't think that S3 Express One Zone offers any additional atomic semantics in the file system world.
As for Express One Zone providing consistency, it would make more groups of operations consistent, provided that the clients could access the endpoints with low latency. It wouldn't be a guarantee but it would be practical for some applications. It depends on what the problem is - for instance, do you want someone to never see noticeably stale data? I can definitely see that happening with Express One Zone if it's as described.