This summary is not the rule. The rule text controls.
Here's a plain English summary of this rule.
If someone wants to challenge the charges against them before trial, they need to file what's called a demurrer. This is a formal way of telling the court "there's a legal problem with how this case was charged." The person has to do this either at their arraignment (their first court appearance where charges are read) or at another time the court allows.
The challenge can't just be spoken out loud in court. It has to be written down, and either the defendant or their lawyer must sign it and file it with the court. The written document also has to clearly explain exactly what the problem is with the charges. Simply saying "I object" isn't enough. The person has to spell out the specific legal reason why they think the accusatory document (like an indictment or complaint) is flawed.
This rule matters because it sets up the timing and format for raising early objections to a case. If someone misses the deadline or doesn't clearly state their reasons in writing, they may lose the chance to raise that objection later.