It does show he is not going to learn from or sincerely apologize for his transphobic statement

Furthermore, I think it’s perfectly fine to bring up such a problematic statement from a person, no matter how old it is, for as long as it’s still relevant. Just because he isn’t making statements publicly doesn’t mean he doesn’t still believe these things, or takes actions (e.g. voting) that supports these statements.

If he had retracted his statements, gave a sincere apology and made some effort to educate himself then it would be different. Then I’d be right along with you in stating that it should just be allowed to rest.

But given that Nutomic has clearly demonstrated that he hasn’t done any of that in the time since his original statement, then it’s fair game to keep such things about his character in the public mind