I suspect you are right....When I was starting out my third video ranked #1 for Japan game shop and has for over a year since. I had 10 subscribers back then. Still get comments on it even though the shop is now gone hahahaha
I think you really need to deliver what the video is in the title and do it early and often to keep people interested
I’ve HEARD, can’t prove, that speaking keywords often in a video helps push it up over vids that don’t too.