to be fair they might be somewhat confused by marketing copy. I've worked on installations like this, and its not uncommon for capacities to be specified as something like 50MW battery (4 hours). sometimes the number of hours is written in a different place to the base output capacity. I think it started because originally the idea is that the battery is some number of hours multiple of the production of a generating asset, like on-site wind. In fact capacity payments and stuff in some countries (read: subsidies) can be different based on the number of hours of the battery