Answer

I haven’t seen the quotations being attributed to him. A priori, I assume this is part of the prevalent phenomenon of silencing, about which I’ve written more than once. Rabbi Ariel is a great Torah scholar, and he certainly doesn’t need me or the like of me to testify to that. Did he create something significant and original that is worthy of a prize? I don’t know.
In general, I support separating the person from his work. If the work merits a prize, it should not be denied because of the person. That is also what I thought regarding Leibowitz (where this was especially conspicuous). Perhaps there are very extreme cases in which I would think otherwise (a mass murderer who found a cure for cancer or conducted groundbreaking research).