all need to be decommissioned at some point, because they will fail catastrophically if they don't.
This is false, that idea comes from decades of anti-science fearmongering. They need to be decommissioned for the same reasons as everything else, they just become too expensive to maintain. Same as every other energy source, including renewables.
Yes.
No. This is the fearmongering part. A nuclear plant that is past its service life doesn't just turn into Chernobyl.
I don't know what article you're talking about, but I'm pretty sure it won't trump my years of university education on this.