Not only did you not read the article, but you apparently don't know that much about TMI either. There are multiple reactors at TMI, the one that had the accident is not the one they're restarting.
The one they're restarting shut down a few years ago, along with several other nuclear plants, due to being too expensive to compete on cost with all the cheap gas post fracking boom.
Yes, for reasons passing understanding the state and federal government allowed existing, functional nuclear plants to close in favor of natural gas plants.
TMI operated safely and without incident for 40 years after the accident. An accident that killed nobody and amounted to little more than a poof of steam.