So can i ask a legit question?

[Kaedi-11739]

Its a lot more complicated than what that video explains. This thread will have better details for you to dive into:

How Competitive Matchmaking and Rating Works (Season 18)

The rating and matchmaking system is confusing, and a good overview does not appear to be available. The official overviews1,2,3,35 are incomplete and do not answer a number of common player questions and concerns. This information below is gathered from sporadic developer posts and videos, salted with my own experience and experiments, various forum threads, and watching streams. Note that since Blizzard does not give exact algorithms, I do have to fill in some gaps, or leave some items unknown…