

The RealDVD ruling is not a binding precedent on anyone. Other judges can ignore it. However, it is likely to be persuasive to any judge evaluating a similar case. This is particularly true where there are relatively few precedents to draw on (which is true for the DMCA).
Judge Patel appears to say that fair use is never a defense to circumventing an access control, but that it can be a defense where a copy control is concerned (the DMCA treats "access control" differently from "copy control"). So it's not clear what she means on page 39, where you got the quote from. Because there is no way to make and play a back-up copy of a DVD without circumventing the "access control" of CSS. So I'm left a bit puzzled by the discussion. ...
Here is what we know: the MPAA and the Copyright Office take the position that ripping a DVD using the usual decryptor tools (Handbrake, etc) always violates the DMCA. Whether that would hold up in court in every case is hard to know. And whether other DVD copying tools might be treated differently (e.g., screen capture utilities like SnapZ) is also hard to know, because it's not clear those tools do any "circumventing."