On age dad here.

That list above has problems in that it presumes all kids born before summer 2009 repeated a grade. In 6th grade most just did pre first who fit this bill. Prefirst isn’t repeating a grade.

I know of zero double holdbacks at 2028 and maybe two kids who are 13 right now because they are fall 2008 prefirst kids.

The reclass wave hasn’t really started yet for 2028s and it will be generally done by on age kids in 8th grade.

There is a difference in being a holdback (repeating a grade) and not being on age. Effectively they are the same thing in that kids are older than most others but the nuance is lost on most here.