In Sierra, did Apple remove the ability to play HLS streams in Quicktime Player?
I have macOS Sierra 10.12 Beta (16A313a) and it seems, that Apple has fixed the issue.
I can't find release notes or something like this to point on exact QuickTime version, where this was fixed.
Just tried here using your link with QuickTime player on latest Sierra 10.12.3, and video indeed does not play.
Strangely - I get the audio only. I tried to use HTTPS instead of HTTP, but then I got an error "cannot parse". from QuickTime
In VLC I see the stream immediately, so that rules out Firewall issues.
So for now, I confirm that QuickTime is broken for HLS playback.