It was a joke - the little winkey smiley should have given it away to most people. The obvious silliness should have given it away as well. Anyway, I just ignore overreactions of this type as they are entirely out of my control, and there are always going to be a few.
I'm sure you guys do in fact burn it well, and/or bury it correctly. But I'm equally sure that the people responsible for all the TP I see above ground along high traffic routes use *exactly* the same reasoning. I don't say the reasoning is wrong at all - but unfortunately for a lot of people the execution, apparently, sucks.
As far as chemicals, I know there are some chemicals they use in porto-potties, but that wasn't what I was thinking of. Along the green river corridor (Utah, very dry, stuff will last forever, etc.) they have some very strict rules. If you rent a canoe and go down stillwater and labyrinth canyons (about 100 miles) they make you take a metal box, basically an UL porto-potty (box with a toilet seat on top, and also with a closeable lid). Think of it as a wag-bag designed to last up to a couple of weeks. They also provide a bag of powdery stuff - don't remember exactly what it is. If you throw sprinkle some of that on top every day or so it stops a lot of the smell. I'd have to do some research to figure out what it was - but I assume a similar strategy would work in your TP bag if smaller quantities, if you have an extra sensitivity with regards the smell. Since the smell comes from the biological breakdown of nutrients, I suppose anything that slowed this would help. I think the powdery stuff was biodegradable at some level because my understanding was you could dispose of the final stuff in a septic system.
Anyway, if it ever feels like it smells too much I seal the bag for the last time and start a new one. I usually double bag those. Except with putting stuff in there, there is no smell involved. You just have to plan for it.