i think you might be confusing a licensing / copyright statement with a citation. these are different things. the statement you’ve quoted in your post above is a suggested citation, and looks to me like a legitimate way to cite a particular collection of observations (maybe except the “Anonymous” part). (we discussed something similar in Looking for advice on how to cite a project - General - iNaturalist Community Forum.)
if you were to want to cite a specific observation from the set, then that would be different.