Wikipedia defines psychological projection as:
a psychological defense mechanism where a person unconsciously denies his or her own attributes, thoughts, and emotions, which are then ascribed to the outside world, usually to other people. Thus, projection involves imagining or projecting the belief that others originate those feelings.
It ascribes the theory to Sigmund and Anna Freud. My limited understanding of the field is that Sigmund Freud was both the father of psychotherapy with many genius ideas and also a poor scientist who did not robustly test his own hypotheses.
So my question is: Is psychological projection a hypothesis that is accepted in modern psychology, presumably as part of a model that makes testable predictions? Or is it an old pseudo-scientific idea that is no longer accepted by scientists? Or has it a different status again.
(Wikipedia provides references, but to papers written by (for example) Freud and Jung, many of them dated around 30-70 years ago. The more modern references (such as this one) didn't seem to have much empirical evidence.)