That is fine. Post the archive link (as you did) and gently let the poster know. You don't know who the poster is. It may be their first time trying to engage here. They may not know about archive. Many things can happen here.
Don't just assume the worse and start throwing words around. We are all trying to have fun, learn and have a conversation here.
because someone else will do it for you? is that really a decent attitude?