This is foolish advice.
Yes there is a stereotype of Asians playing musical instruments. That doesn’t mean that applicants of Asian heritage should leave major ec’s off their applications. Each applicant is what they are.
Again, especially for future kids reading this thread, lean into your main ec’s regardless of how stereotypical they are. By the time you’re applying to school it’s too late to change from violin to skeet shooting to make yourself unique and no school (that I know of) has a skeet shooting team anyway. Be who you are!