Maybe just a mistake on their MSDS, but disposal rules are listed as following hazardous waste guidelines, a degree of magnitude above the industrial waste rules that govern disposal of most detergents. This may be due to it's reactivity rather than toxicity, but I'm not sure too many places that have concerns about green cleaning are going to like that listing.
And, just like all of the other encaps, health effects are listed as "not tested."
Green claims can be a head-scratcher sometimes.