The creditor filed that to protect himself.
When you file bankruptcy, the court imposes something called the “automatic stay,” automatically, which stays (stops) any creditor actions against you. It normally stops garnishment, foreclosure, even those pesky phone calls.
Now if a creditor has already filed a lawsuit in state court, that lawsuit cannot proceed. It is frozen in place unless the creditor files a motion for relief from the automatic stay in the bankruptcy court. He can do nothing in state court until or unless the federal bankruptcy court grants that motion.
Sometimes the creditor will file that “Notice of Bankruptcy Stay” to explain to the state court why he is doing nothing in the case. The creditor doesn’t want to be accused of inaction, or even worse, of neglecting a case, so he will file that notice to explain why nothing is happening.
Usually, you get your bankruptcy discharge, and then the creditor can dismiss the state court action on their own, or if they simply do nothing for long enough, the state court will dismiss the suit. If your bankruptcy case is thrown out for some reason, the creditor will notify the state court of the bankruptcy dismissal, and they can proceed with their state court litigation.
So the notice doesn’t really affect you; it just protects them.