Is it plagiarizing when you copy stuff that isn't even factual? Merriam-Webster: > : to steal and pass off (the ideas or words of another) as one's own : use (another's production) without crediting the source
I guess so.
No, it's academic dishonesty: representing work that you did not do as your own work.
ETA: "Academic dishonesty" also covers things like falsifying data and willfully misattributing sources, which is a closer approximation to this case.