Surely it is very clear spoilers are not observed at any point on the video and it should be possible to see them if they were deployed. Ergo they didn't deploy - not automatically, not manually and not with the eventual application of reverse thrust. There, I've said it (now ducking for incoming). Hence braking not as effective as it should have been. Now waiting for investigation to find out why spoilers did not deploy and why reverse thrust, which would have also helped, both seem to have malfunctioned.