"Multiple Elements with Text" example seems to be broken

Questions
1

I’m looking at the “Multiple Elements with Text” example and it seems to have stopped working in the last few months. Testing in Firefox, I get this console error:

Uncaught TypeError: invalid assignment to const ‘parent’

It seems that it doesn’t like that parent is getting its value re-assigned since it’s a const

const parent = document.scripts[ document.scripts.length - 1 ].parentNode;
// ... Other code, then
parent = document.scripts[ document.scripts.length - 1 ].parentNode;

Looking at the file blame view, it looks like MarcoFugaro might’ve run a script that automatically changed it from let to const, perhaps? Anybody know if this was unintentional?