I think it materializes toxicity in the archive well, as the author intends. Toxicity is made through knowledge and that knowledge must exist in the world in certain forms in order to do the political/scientific/governing work intended of it. Someone must care for, interpret, and archive this toxic knowledge or it will cease to exist. I would love to see the author unpack this idea of toxic archiving more through this image.
Only what I said above about the caption's tone.
This is a photograph, not taken by the author. The composition is very helpful in communicating ethnographic scale and the character of the subject. I find it aesthetically very engaging.
I think you can reframe the caption into ethnographic writing (right now its a bit self-conscious), so that you describe Wilma, her history of engagement, and what these papers represent to her and the history of the case (and why paper not digital?) and then broadening out to your wider questions about archiving the anthropocene and its political stakes.
I love how this image sinks us into the materiality of archiving a complex environmental problem. It communicates a "david vs. goliath" situation and forces us to imagine the enormity of information and knowledge that must be processed to politically contend with the chemical industry.