This summary is not the rule. The rule text controls.
Lawyers who are working on a criminal case that might go before a jury need to be careful about what they say publicly. They cannot make statements to the media or public that could unfairly influence potential jurors before or during the trial. This applies whether the lawyer is prosecuting the case, defending it, or investigating it.
The key question is whether a statement is likely to reach the public and cause problems with a fair jury trial. If a lawyer knows, or reasonably should know, that something they say could taint the jury pool or interfere with a fair trial, they are not allowed to say it publicly. This covers comments to reporters, social media posts, or any other statement meant for public consumption.
Lawyers also have to watch out for their staff and coworkers. If a lawyer's employees or associates might make these kinds of risky public statements, the lawyer has a duty to take reasonable steps to stop them. A lawyer cannot dodge responsibility by having someone else on their team say something the lawyer legally could not say.
This rule exists to protect the right to a fair trial. Jurors are supposed to decide cases based on evidence presented in court, not based on what they read in the news or hear through public commentary. When lawyers talk too much about a pending case in public, it can shape public opinion and make it harder to find jurors who have not already formed an opinion about guilt or innocence.