Solid waste is 75% water and so dissolves within a few hours (and so does quick-dissolve TP, btw). So a little patience would have deprived him of a good "war' story.

Next time you can't pump a tank out, check the tank vent thru-hull for a blockage...also the the vent line connection to the tank...both that end of the vent line and the tank vent fitting.