No, that's like calling Amazon a social media platform.

YouTube is a content delivery platform that has social media features. You can tell because if you shut off all the comments, people still visit the site in droves. But if you shut off the videos and left the comments then nobody would visit the site at all.

Now, it's possible that YouTube doesn't realize that, but I think they're just unwilling to make any changes at all if it doesn't give them any competitive advantages.