Hmm, my Mac/ClickToFlash/Ghostery combination has no problem playing that video. Looks like a particular setting there, or something else entirely is gumming up your replay works... I can confirm this. For the record, I have Adobe Flash preferences set to block all cookies. With some sites (BBC News, for example), that prevents playing videos but this does not seem to be the case with Hal's link. I also have ClickToFlash and Ghostery.
Jon
macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365
| 
