I would say that no one assessment is enough to correctly determine a student’s successes/difficulties. I suggest looking at the graphs for the individual tests, and if there is an indication of a problem, use other tools you have to investigate further. Conversely, if you notice that a child’s score in an area appears to be higher than you expect, you might also follow up with other tools.
I think most of us would agree that a computerized reading assessment can’t give you a complete picture of a reader, but maybe it give us a place to start.
I know that assessments like this are often used to identify kids for RtI and to recieve extra help, but hopefully, teachers like you can bring that sense of reason to the whole process.

We use IStation on our campus, and I don’t really find it useful when some of my students are not reading on grade level.