We have a few instances where non-SRD/RSRD/MSRD material has been commented out in our distributed datasets as opposed to deleted. See for an example http://games.groups.yahoo.com/group/pcgen/message/106334
This may not be limited to the SRD/RSRD/MSRD but other datasets as well.
RSRD - Completed: At revision: 15599
SRD - Completed: At revision: 15601 [Mainly clean up of the set]
MSRD - Completed: At revision: 15602
Core Sets vetted for commented out items. Didn't verify their validity, all pulled info is held in BoD for final review. SRD and MSRD mainly clean up of sets. Supplemental sets beyond the core should be fine as License reviews all sets before inclusion.