After revisiting this forum post a year later, I realize that I focused my reply on the acrylic resin question and I overlooked that something Teabellini said was incorrect:
We do not state that epoxy resin is toxic on our website, but I expect that this forum thread from 2014 is what Teabellini is referring to.
Epoxy resin, including the Art Resin product that you linked, is safe to try, but we do not know how well it will cut.