I'm going to very neutrally state that you should have participants label these as "content warnings" and not "trigger warnings". It's essentially the same thing, but it really does take the sting off when you see "content warning: couch cushions" rather than "trigger warning: couch cushions".

Content warning is a neutral term that, by in large, most of the things on that list should probably have anyway. Trigger warning is not.

Either way you are warning people about things that could make them uncomfortable and also not appropriating the use of a word that once had a severe meaning but is rapidly devolving into a buzz word for things that make people uncomfortable. I'm not saying that the above list is in any way, shape, or form, but it's becoming more and more widespread and that is not okay. Words evolve but this is taking a massive step backward.