I probably should've quoted this part, as well:
Of the 22.6 percent of households without a centralized sewage system, 16.8 percent use a system of pipes connected to pit toilets, RBC cited the State Statistics Service, Rosstat, as saying. The other 5.8 percent lack a sewage system altogether.
I guess piping sewage into an open pit counts as a kind of system, and it's definitely septic.
I saw a post in this community that might be about this, but it's literally an article about a new Russian disinformation campaign that mentions secret torture sites.
It seems most charitable to believe that your reading comprehension and critical thinking need work.