I did that first. Didn‘t work. Probably my fault, but to be honest, I had expected the interface of Hype to provide a button or something, where you can set "on load" yes or no. So, I was rather astonished about that lacking, since the most common use case is probably not to start an animation on page load, right? What if that thing isn‘t even in the viewport. Although I had read quite a lot of instructions and watched video tutorials, I had the feeling that there is a natural end to what one has to study to just do that simple thing.
So, had to figure it out somehow. Quite frustrating for a beginner. The way I did it now may make no sense, but it seems more obvious to me - and it works. Thats all I want at the beginning. Maybe later I get more curious about the logic of timeline nesting, but not for now.