Per my local USSSA rep, there is no rule against a parent providing info to the coach.
I quote:
"Coaching info from parents. You are correct there is nothing against a parent telling a coach what they see or hear. Just one of those things."
It appears high school is different as it is specifically covered .
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Not to throw shade on anyone but it wouldn't be the first time a local rep got something wrong..... And to be fair, the internet isn't always right either. Marriard maybe, internet? No. ;-)