I’ve tested the video link you posted above on an iPhone. The video worked fine.
Here are details of the phone:
Version 12.1 (16B92)
Mozilla/5.0 (iPhone’ CPU iPhone OS 12_1 like Mac OS X)
AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.0 Mobile/15E148 Safari/604.1
I noticed, that the menu icon is a bit off on the page. You can see it in the screenshot. https://prnt.sc/lriohd