If it's a legally-made recording -- and thus the property of that person who pressed the "record" button, free and clear of any obligations -- what could be illegal about posting it publicly?

As others have already mentioned, she could have signed an NDA, but those are typically narrow and only apply to technical data, marketing data, sales data, etc. There could be something in there about "internal processes," but it's a stretch.

She could have signed a non-disparagement agreement, but there's nothing in the video which constitutes disparagement.

So I'd assume that she's probably okay. And she did a good thing by posting it.

Besides, legal action would need to come from Cloudflare, which would be an extremely bad look for them.