Derivative Grandfathering

The spouses and children of persons who are grandfathered under §245(i) are also grandfathered. The March 2005 245(i) Memo clarifies which spouses and children have this benefit. The following scenarios assume that the spouse or child does not have his/her own, independent basis to claim the §245(i) benefit.

Spouses / Children :

At the Time the Petition or Application that Conferred §245(i) Was Filed :

If a person was the spouse or child of a §245(i) beneficiary at the time that the qualifying immigrant visa petition or labor certification application was filed, that spouse or child remains grandfathered under §245(i) even if couple has divorced or the child has reached the age of 21 since that time. This means that, even if the spouse or child is no longer eligible for derivative adjustment of status, the spouse or child can obtain adjustment of status through any other means available and use §245(i) to achieve this goal.
quoted from http://www.murthy.com/news/n_usc245.html

I would think that the above information is for filing purely an I-130. I understand that as is i can't adjust within United Stated. I also asked if any sort of waiver is available that can apply to my case. I understand that I was not eligible for derivative adjustment of status because I aged out and I-140 was filed past 2001 deadline. However this quoted statement tells me that as long as my fathers application (COL) was approved before the 2001 deadline, i'm still considered gratfathered under 245i. It doesn't mention that I require to have applciation filed on my behalf before april 20 of 2001. Is this correct? Also what other means do i have to adjust myself under 245i if possible. Thank for good info so far.