I don’t agree with the thought that it’s rude to tell a candidate that they’re not qualified / not likely to be accepted. If someone in admissions tells you that - given their incentives to get as many applicants as possible - they’re almost certainly telling you the truth. (Whereas something like “I can’t guarantee anything, but you should definitely apply!!!” is totally vacuous.)
Even if your kid is great and would thrive somewhere - maybe even at that school - it doesn’t mean they’ll be accepted there… I think there are tons of kids that would thrive at top schools who won’t get accepted there.