@TiggerDad Those scores/GPA would put him at 180 which is just slightly above the Ivy current minimum of 176 so he would still be considered admissible by the book. Most Ivy athletes are closer to 220 on average (higher at HYP) so the scenario would still be considered extremely rare and would almost certainly only be used with an exceptionally outstanding athlete such as the one referenced above.
To the OP - your GC is correct. According to last year’s admission statistics, only 12.8% of students in the very top range were offered admission. As @TiggerDad pointed out, “being admitted to Ivy League colleges is possible with low stats, but the odds are extremely low unless you have something else that these colleges desire”. The ‘something else’ would almost certainly need to be an accomplishment that would put you at the top of your talent area at least nationally (athletics, music, science etc) if not at some level of world wide recognition to be admitted with those stats.