Generally, I consider defamation to mean: made in bad faith, not provably true, and with a goal of harming the target. It's pretty clear the definitions and laws have changed.
Note that Gino is also suing her employer- Harvard- who conducted a review and put her on leave. She has absolutely zero chances of winning this case or salvaging her career, as she has to prove that she didn't carry out research fraud (by editing raw data before publication), because she published the evidence of her actions.
We can expect that her case will be shut down before it reaches trial.