Not necessarily true. A hyper competitive school will also have the profile. I do not know if TJ in VA ranks, but I do know in the nation it is considered one of the top public HSs. Let's say the avg SAT best sitting is 2300 (the dummy scores 2200), that 95% of the kids take at least 12 APs., and their after HS education profile is 50% go Ivy, 25% go 4 yr Private and 25% go 4 yr Public, the SAs can see that even the bottom of the barrel would be considered competitive.
It has been a few years since my last graduated HS. However, if I recall their school profile also included the avg cgpa for the graduating class, that included the weighted scale and the grade scale (7 or 10 points).
If you were on the board and saw all of that info from the school profile that the GC submits, you would be able to tell very quickly from a ranking perspective.
As ca2 stated you cannot excluded it. However, I really wouldn't worry unless your school profile shows something to raise the eyebrows. IE. you took very little APs compared to the others when you had the opportunity. A top 20% if the school send 25% to Ivy looks better than 20% and 0% go Ivy.
~ The latter says to me there maybe a problem. Has the brains, but is not committed to doing HW and applying their brains everyday in the class room.
This is why many posters do not put much credence in the cgpa when posted here because we don't know your school profile.