The OP is getting great advice.
While ALL elite prep schools advertise excellent college admissions stats, as @sgopal2 states, once you drill down into who is actually admitted and filter out the recruited athletes, legacies, URMs and development cases, there is very little room for the unhooked.
More specifically, the athletes tend to be in sports where scholarships are less important (i.e. lacrosse, water polo, squash, etc), the legacies are also meaningful donors (legacies who don’t give have to be famous), URMs are already preselected for their admitability, and the development cases are obvious (and increasingly international).
The college counsellors at schools like PA are extremely experienced and know that the number of kids that can be admitted to each Ivy is limited, so their advice for the unhooked senior will be biased. Heaven forbid an unhooked applicant gets in over a prized development case or URM.
Where the elite private school’s college counseling is the most effective is getting students into the schools that are just one or two tiers below the Ivies/Stanford. Looking at the matriculation lists many have provided, with 20%-40% of elite private school graduates going to Ivies/Stanford, the next 20%-40% seem to go to great universities like Duke/Northwestern/Vanderbilt/etc, or top LACs like Williams/Amherst/Swarthmore/etc. While schools in these “lower tiers” are also extremely difficult to get into, these are the primary beneficiaries of the increased competition at the Ivies that we have seen over the last several decades.
So, like many of the posters to this thread, I would agree that PA is a great school for many legitimate reasons, yet to choose it primarily for an ivy league admissions advantage might be ultimately disappointing.
If the goal of an Ivy is unshakeable, and you are an undergraduate legacy, you should start (if you haven’t) giving money now. Legacies who don’t give do not get much of a boost. While large donations will only help at your alma mater, most Ivies like to see a history of giving, not just when your kid is applying.
On a separate note, from the perspective of someone who is an alumni interviewer for an Ivy, in our region (not east coast), unhooked private school applicants are not getting in to the same degree unhooked public school kids are getting in. This is a relatively recent phenomenon, but seems to be a trend as all schools try to be more diverse and inclusive. Low income, first gen and students from remote locations are also becoming hooks.