It is true, but I find it kind of impossible to justify bitching about the repetition of something you weren't here to experience, in other words, yes it's repetitive, but you only know that because you went looking for it, not because you were able to actually notice the repetition because you were (under this username at least) an active user of this website at the original time. It's like me complaining about a repost even if I respond to the repost and would never have seen the repost otherwise. What's the point? The repost didn't damage you. In fact it brought new information to you - AND, you're contributing to it besides.
If you don't like that the question has been asked before you have more constructive options:
1) Respond to the original thread
2) Don't comment and don't share
I think it is more positive to think of reposted AskHubski questions as potential opportunities to update us on your previous answers, assuming of course that you were around at that time. You weren't even. This is a new opportunity for you to provide an answer, which by the way you did. So why are you bitching about it? No one is forcing you to answer this question, clearly you decided that you wanted to.
Like, at no point am I debating the truthfulness of your statement. I am debating its validity when brought to the discussion by you.