Academic Interview: What is your Greatest Weakness?
I would answer it as recommended.  The best strategy is probably to admit a real weakness that is relevant to the work (which shows honesty and the ability to be self-critical), but focus on how you are working to improve.  There's nothing really academia-specific about this.

Your examples seem largely fine to me, except "I have trouble managing my work-life balance" is too vague and could be interpreted as a very serious issue.  So I would avoid that or make it more specific.

I wouldn't spend too much time preparing for this question. Its reputation as a common interview question is greater than the reality. I've never been asked it (at interviews in and out of academia).

It's a poor interview question, really, because it's unlikely to lead to genuine insight on the candidate. Good interviewers don't ask it. Your main task is just to avoid a big mistake. Don't say your biggest weakness is plagiarism or stabbing colleagues in the back, and you'll be fine.