There are no right or wrong answers to the forum questions on the two previous topic pages (only well worded answers that are backed up by well reasoned arguments). One could cast doubt on the veracity of the video solely based on the number of comments which argue for its inaccuracy. One could also make the case that YouTube comments themselves don't have a lot of veracity. For example, YouTube comments are rarely sourced or backed by direct evidence.
The activity you have just completed underscores both the complexities and importance of evaluating sources of information, whether they be YouTube videos, online comments, blogs, newspaper editorials, infographics, or academic articles etc.
One helpful tool for evaluating sources of information is the CRAAP test.