I'm not going to make an account to watch this video, but YouTube comments have been broadly broken for at least a year now and I highly doubt this is a wordfilter thing. It often takes weeks for comments to display on new low-traffic videos, and sometimes they just get lost to the ether. The claimed number of comments rarely matches the number which are displayed.

On popular videos, comments with the most upvotes (often containing important info) are no longer shown at the top, even when sorting by 'top comments'. And even when they are from the uploader. YouTube uses some other esoteric criteria to decide what you should see.

What I'm trying to say is, if you're using YT comments for actual discussion or recording information then you're doing it wrong. They are there to help promote a broad feeling of engagement. It does not matter in the slightest to YT whether every visitor to the page sees the same set of comments, its irrelevant.