Is there a secret star in the castle courtyard?

In the back yard of the castle, there's the course called "Big Boos Haunt", but there's also this curious sign in the corner that says something about a triple jump and a wall kick. The thing is that right near that is a convenient wall, which might be doable with the aforementioned combination.

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Is there a secret star here, or anything useful?

Edit:

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Actually based on this (beware, spoilers) I'm going to go ahead and say no. Now that I think about it I remember being similarly confused by the sign but could not find a star nearby, and that site confirms that the secret stars are elsewhere.

Edit: With the second screenshot I remember even more. There's definitely nothing there :)