Agile requirements (unlike in document-centric requirements elicitation, in a "waterfall" development process) are initially captured only roughly. A detailed specification is made created only immediately before implementation, often as user stories.
This tool is geared towards document-centric requirements elicitation ("waterfall"). User stories for the agile backlog are derived selectively from the prioritized functional requirements for the sake of methodological completeness. In practice, this would not be done - the product owner would create the backlog directly. Therefore, here (but only here!), this tool does not represent a realistic process. In an agile project, you would skip the majority of the other artifacts specified in this tool.