This summary is not the rule. The rule text controls.
When someone is found unable to stand trial because they aren't mentally competent, they usually get treatment to help them regain that competency. If the doctor or medical team overseeing their treatment believes the person has improved enough to understand the case against them and help with their own defense, they must report this to the court.
Once the court gets this report, it must schedule a new hearing to check whether the person is really competent now. Both sides can present evidence at this hearing, and the judge decides whether the person meets the legal standard for competency.
If the judge finds the person is now competent, the criminal case starts moving forward again. This means the charges that were paused can now proceed through the normal court process, including things like trial preparation, hearings, and eventually trial itself.