The trigger warning is because the topic can be emotionally heavy for autistics since it talks about the social abuse autistics endure and how we react to it by masking. The guy has an apparent justifiably angry tone throughout the video. Otherwise, I think it is fine and there are no sensory issues to worry about.
For those that downvoted, I would like to know why. Why did you think that it should not be seen by others?
The trigger warning is about autistic people being abused. It is relatively fine sensory-wise, though the guy is justifiably angry when discussing the topic. I put the trigger warning because it was an emotionally heavy topic for me, so I wanted to let others know that it was not easy.