I don't know why people say that Brick, as I've never experienced sudden ball death of any kind for any reason, including using Renew-It. I doubt that anyone from Hammer "proved" that Renew-It was responsible for killing a Hammer ball.
I don't have any scientific evidence to support my opinion, but I've been using this stuff pretty much every week for about two years, and I have seen no ill-effects.
Oh, and although I don't own a Hammer ball, I have used Renew-It on balls made by AMF, Ebonite, Columbia, Lane #1, Brunswick and Storm.
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seadrive
Cogito ergo bowl