A few things to think about regarding this apparent "Bug":
-So far no confirmation of any score counterstop (if anyone can provide of evidence of one, please let me know), 272bil is the highest anyone can confirm. Many doubt a counterstop is possible due to the fact you can only do this at the end of stage 5 and there simply aren't enough enemies (or time in a hyper) to accomplish it.
-If you can push the score to 999bil, it's possible the counter may go to 1 trillion (there is space for another digit), or roll over to A0000+, since Yagawa is a programmer on it.
-A growing number on 2Ch, as well as fu (the guy who made the video) now doubt this is a "bug" since it displays all 9s in the GP meter and resets back to a normal level on exiting a hyper. It may just be a hidden, upper level fever mode.
-Cave has said they will not update the game - an admission that this is not a bug, or apathy on their part?
Right now I think we just have to wait and see how this all plays out, and we should not jump to conclusions.