They are reporting on what he told them. Would you expect a news outlet to be able to somehow verify the testimony of a prisoner of war before reporting on it?

The title and article both make it clear that they are reporting his story.

Additionally, the rest of the article - including the ones before and after your quote - discusses numerous cases of other similar scenarios.

I’d imagine you’d need a browser that has developer tools, which is far less common on mobile. A simpler solution would be to use a separate app that just takes the page URL and downloads the video for you, such as this one: https://f-droid.org/en/packages/com.junkfood.seal/