It is internal document which regulates how DHS and USCIS are going to treat filing of AOS. Even that document says, if you read further that statement based on an approved immigrant petition.
Do you understand the same that since your I140 is approved and ROW does not have "U" you can file I485 ?
But seriously:
Why do I have to prove to you and to some "immigration practitioners" that I understand that I485 will be not accepted if PD is not current or has "U" ?
My point was that may be internal agreement/rule between USCIS and DHS but not the law which was approved by Congress. The reason for that rule could be INS backlog elimination.