This is the 3489th most frequent Japanese word.
称し
"称し" means "to call oneself" or "to claim to be."
In this sentence, "称して" means "to refer to oneself" or "to call oneself" in a way that introduces or identifies oneself with a particular term.
彼は自分を天才と称している。
He calls himself a genius.
Here, "称されて" is used in the context of being referred to or called a certain name or description by others.
その町は観光地として称されている。
That town is referred to as a tourist spot.
In this sentence, "称して" means "to describe or name an activity or action using a certain term" for the purpose of providing context or rationale.