Given this, I think the journalist over-simplified the situation in their story and that the "F12" jokes are unjustified. Recognizing there's a disclosure of private information here requires a lot more technical knowledge beyond the ability to view the HTML source.
The governor is still wrong for pursuing this and what the newspaper did was right, given that they disclosed it to the responsible parties and didn't publish until the problem site was taken down.
It's hard to call this encryption.
Okay, maybe that's not very efficient.
Each pair of Base 64 characters contains a single ASCII character, plus some change. That would take three lookup tables of about 1000 entries each; given that the “change” letters could use character ranges, that would take 3 or 4 sheets of A4 (or A3, if you wanted large print).
Best I've done so far is to recognize that "eyJ" means I'm probably looking at JSON, since `{"` followed by any letter will always begin with that.
> It's hard to call this encryption.
It's a lie to call this encryption. It is encoding, not encryption.