You say, “ What Ratzinger has written supports the position non-Roman Catholics have taken in that Rome has created the various dogmas they believe which are not found in nor grounded in Scripture.
Attempting to cite John 16:4 for support of this "subsequent" remembering allows for a hole big enough to drive the solar system through and allow Rome to continue to develop pretty much any dogma desired.
What part of “already handed down in the original Word” has a hole big enough to drive the solar system through?
It’s his redefining “tradition” that is the hole behind enough to drive the solar system through. His definition allows pretty much whatever Rome wants to claim it’s now “remembered”. The proposed Fifth Marian dogma comes to mind as an example.