The very edgy and sharp corners of the script, show it's late and likely from the Himyar period. Then you have the title: Kings of Saba and Dhu-Raydan. The mention of both "houses". The mention of Abyssinia. And of course the description from youtube itself are some of the first and most obvious pointers. There are probably more if I'd cared to read it again, but I it's 5 am and I'm going to bed now.