It would appear to be something like that.

> However, we did not anticipate that the expansion process would require the server storage to be temporarily offline.

This is embarrassing. Somebody made a big mistake of the “mistakes like this shouldn’t be made” category. Like not an accident or fat finger or a bug, but engineers not understanding fundamentals of how a system worked and having none of the processes in place to to dry runs in non production or any of the other things that would protect against something like this. Really questionable to trust an organization that makes a mistake like this.