My understanding is the CRA reporting is correct. Once they make a new agreement with the borrower and that agreement is met the borrower is paying on time.
Well think about its "correctness" this way...
You're a lender. Maybe you're a bank, or maybe you're an individual lending thru some P2P thing, like Lendingclub. Joe Borrower comes to you to borrow $10,000. To assess the risk of this loan, you pull a credit report on Joe. You look at his credit score, and you look at things like whether he is delinquent on any existing credit lines. You know that people who are presently delinquent are in financial trouble, and are bad risks. This matters a lot to you, because making choices based on good data is critical to your profit or loss. You depend on the credit report.
Unfortunately, the credit report shows that Joe is current on all his credit lines, when in fact he can't pay the loans he has already taken out, and is paying a little tiny payments each month under an "agreement" with Prosper and other lenders. The credit report doesn't represent reality. But wait, there's more. The credit reporting agency computes a credit score based on this incorrect information You use this bogus credit score and the bogus current delinquents data to decide to make a loan to Joe.
Joke's on you ... Joe defaults on your loan. He was in bad financial trouble when you loaned him the $10,000. This information was hidden from your view. You've been mislead, and the crime is material. The misinformation has cost you money.
In general I don't have a big issue with this as long as the borrower was significantly late before the agreement was made.
They're doing at at the 1-month-late point as I understand it.
In this specific instance, while I can see where this sort of agreement could benefit the lenders,
It might benefit the lenders. I don't know whether it will, but it is certainly possible. However I don't think it is appropriate for Prosper to violate various contracts (lender agreement for example) just because they think it benefits the lender. Long ago Prosper should have and could have amended these agreements to add various issues such as delayed payment agreements, loan acceleration, etc. They didn't. Every time Prosper violates their contracts they give the guys on the other side of those contracts (borrowers and lenders) license to do the same. This is bad business.
Second is the fact that Prosper has a long history of failures, so I have little faith that the well-meaning change will be implemented in a manner which will actually benefit lenders.
Community payments come to mind.