They absolutely should be used if it’s not apparent from the cover. A person with rape induced PTSD will benefit from knowing they need to either not consume this media or be ready with their coping skills.

What’s not helpful is putting them everywhere there is even a tangential chance of something. This speech could do with one. Some streamer using the word rape pejoratively does not. And of course it isn’t going to make the anxiety any better. That’s not the purpose of a trigger warning.

The difference between having your coping tools at the front of your mind and ready to go versus being surprised by graphic depictions of your trauma can literally be weeks of depression and panic attacks versus a few minutes of mindfulness exercises.

Edit to add - for a bunch of psychology professors they miss the point pretty impressively.