@Migs86 That video code plays in Safari on my system when included in an otherwise bare page. The only issue I see is that the playsinline parameter is not correct syntax, but that shouldn’t make the difference as to whether or not the video plays.
Thank you for the follow-up to let us know the root cause. It makes the topic much more usual for people searching the web and coming across this in the future. Thanks again for taking the time to share what you discovered!