I don't like this 'trend' of the things appearing with an animation as you scroll, I find it irritating and sometimes confusing.
Anyway, the problem here seems to be that the threshold is way too high, it only triggers when you scrolled the whole content away.
The problem is that the example videos auto-play and can be quite distracting if they're visible by default.
They are .webm and .webp. Which browser & browser version are you using?
No play button is displayed, no video playback control bar either, and pressing on space bar does not start the video. Right-clicking over the video shows a context menu with "play" option.
It is confusing to see these as screenshots of the cluttered interface and no indication that these are videos.
I made the bad decision of hand-coding the landing page in React, this is the result of it :)