I think that Coleridge does view poetry as a source of knowledge.  One of Coleridge's primary points is the idea that poetic analysis and poetic expression can represent a way in which one knows the world around them.  Coleridge makes the point that the poetic exploration of the individual allows them to better understand the nature of themselves and their world.  Poetry is seen as something that is reflective of both the individual components of the world as well as the world itself.  In this pivot to bridge subjective and external perceptions of reality, Coleridge makes it clear that poetry can be seen as a form or mode of knowledge.  Coleridge understands clearly that the idea here is to explore the poetic form or mode as a way to perceive and to understand reality.  In this construction, it is evident that poetry is not dismissed as something trivial.  It can bring greater understanding towards what is understood and perceived and what can be gained in a larger sensibility.  Through such an idea, Coleridge is able to fully grasp how poetry is a mode of knowledge and a reservoir through which greater understanding can emerge.