Except it wasn't a production endpoint and there's no actual security risk in having source maps available. It's more annoying to read source code that has been minified, but if a security professional tells you that minifying source code is something that increases security, you should be wondering what other bullshit they've pedaled you.
I'm not a fan of persona and have gone out of my way to not provide my details to them even before this, and I really dislike Thiel, but... let's be honest about the stuff we're complaining about.