The wording wasn't trigger warnings existing in a broad sense. A trigger warning on every art installation is a position many would regard as clearly excessive. Not sensitive content, not things that could be expected to be upsetting to some significant minority of the population, every art installation.

Imagine that every time you went to look at a digital representation or photo of art, you had to click through a trigger warning.

Seems like it could, in some cases, be a bit excessive. Although I understand if some people find still lifes of fruit terrifying.