You could argue that it's teasing or engagement baiting I guess but it isn't clickbait.

No. Engagement baiting is, for example, purposefully stating a wrong fact or pleading people to write comments in other ways, like wanting to talk about the contents of the video while having no intention to actually read any comments, let alone talk to anyone.

Any element that is enticing you to make you click on a video, like an obtuse headline, or idiotic shocked faces, or arrows / circles / boxes of various colors, are all clickbait tactics.