relax, Dewey, nobody called it "scientific". And, however un-RV those hikers tests were, the results are consistent with other sources.
I find it useful to learn that not only water breaks the TP down. Burying it in the ground would be another alternative. You never know when you might have to use this method. Though I would rather burn it in this case.
RV toilets, on the other hand, have always been the edge of modern science and technology, with super-smell-retaining plastic, microscopic stream of water and extra-small seat :)... The convenience of this ingenious design only rivals RV shower heater, with 20 minutes waiting time for a 7-minutes shower...
I wouldn't use the term "dissolve" here. TP breaks down into sludge, cellulose fibers. To actually dissolve the fibers will take a bit more. Couldn't find any easy to understand write-up on cellulose fibers disintegration without using heavy chemicals.