What does Winston not consider what he is doing as forgery?

Winston does not consider his actions as forgery because he believes that the documents he alters are not genuine representations of truth but rather reflections of the Party's constructed narrative. He feels that his work, which involves rewriting history, is a form of resistance against the oppressive regime rather than deceit. Additionally, he sees the Party's manipulation of truth as the real forgery, making his alterations seem justified in contrast. Ultimately, he perceives his actions as a necessary means to reclaim authenticity in a world dominated by lies.