Granted

1. Does the highlighted section of the following context mean "Wagner believes that this unconscious content is hidden behind an artistic layer and that it is this artistic layer and not knowledge of her biography that allows the viewer to access this unconscious content"?

2. What is the role of "Granted" at the beginning of the highlighted section? It does not make sense to me.

Context:

... Anne Wagner’s insistence that Hesse’s ‘practices of both drawing and sculpture may have been in some definitive sense the products of unconscious processes – and as such among the means she used to come to terms with the loss of her mother’. Granted Wagner does situate this unconscious content as being screened or propped behind strictly artistic concerns and that it is the latter which allow the viewer access to the psychic charge of the work rather than knowledge of the artist’s biography.