When I download it I can play it in VLC, and according to MediaInfo HEVC encoding.
Is HEVC support not included by default? Chrome should support it, and Firefox shouldn’t support it at all according to the compatibility charts.
Maybe there’s some site bullshittery going on and the site is giving out different versions of the file to different people based on region or something. The file it gives me is 2,661,216 bytes. Is that what you get?
Edit: Works in Edge, although feel like I now have to go wash my hands after firing that up.