Here's what I've seen today when checked out the question. I suggest to remove this post notice (and just show a message after someone who had not enough reputation tried to answer) or at least to move it to make it somewhere less visible.
- Most important thing in question it's the text of the question itself.
- Only some of users who check the question have an intention to answer it themselves.
- If you are an active user and you are allowed to answer it isn't really that important for them to know that they are actually allowed - it's assumed by default.