It is a nice video. Here are some other videos made by the same author.
https://www.youtube.com/channel/UCbjRDDLzQ6jLYBrU0BPGbrA
We can see that these videos are not made at the same time and not against the same samples. So the results of a few such tests cannot be compared. If we saw 100 similar tests in one month (with some other AVs), then we probably could say something more about the effectiveness of tested AVs (assuming that the author chose random samples)
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The problem with such videos is that after the test we still cannot know if the result is good or bad. Even if we assume that these are fresh in-the-wild samples, there is no reference to other well known anti-ransomware programs (via tests on the same samples at the same time). So, we do not know if most AVs could block all tested samples or none.
This video only proves that the tested AV is not 100% effective. But, we knew it already about every security software.
Anyway, If one could see all MT videos about AV tests from the last year, then probably could also say which solutions are good and which are bad.