parameter swapped in SimilarityTransform's estimate method

From the documentation(https://scikit-image.org/docs/dev/api/skimage.transform.html#skimage.transform.SimilarityTransform), I notice that the order given to estimate is swapped.

https://github.com/deepinsight/insightface/blob/4a4b8d03fec981912fdef5b3232a37a827cbeed6/src/common/face_preprocess.py#L61-L72

Is there any reason to swap the dst and src? Is that a mistake? If it's intended, it would be more clear if it's written as estimate(src=dst, dst=src) to avoid any confusion.